Solving linear systems by substitution | Algebra Basics | Khan Academy

[@pookiesamurai7500]

this short video explained more than 45 minutes of rushed class time , thank you khan~

[@cat_jk00]

Yeah, the problem with a lot of math teachers is the fact that they have been good at math for their entire life, and they can't see that some people aren't. Great teachers had to work to become great, and other's didn't.

[@pookiesamurai7500]

Exactly.

[@nooneliveshere9303]

Thank you khanye very cool

[@tati.5664]

right!

[@abendeavours4200]

Sal*

[@atishayajain5073]

I despise online school, I suffer from adhd and I can barely concentrate in my home environment compared to my school environment. My grades went from As and Bs to Cs and Ds and i almost failed 1 course not to mention that I am now 5% from failing math. This man is helping a lot during pandemic. Even if some of his videos were made over 10 years ago.

[@tyywtf]

same dawg

[@Uniquesoup]

same

[@ndmr7095]

same

[@Nobody64928]

omg! cant say it better myself 5/5

[@Creative_mr_gold]

Skill issue

[@mcmiller1537]

Khan academy is literally the only way I understand math.

[@Grayman2003]

MC Miller Same. Lol

[@Unluckyleon]

MC Miller I'm have a. Test tomorrow and I'm doing last moment khan academy revision XD

[@minkihairoil]

Lol I don't get it styll

[@suavefrog5029]

They teach me better than most of my math teachers 😄

[@mepe705]

Mc miller same I’m literally watching this before I need to go to school and I have a test

[@shirokatsumi364]

This was easy than I thought. I only learned for 5 mins by watching this video, while 3 hours of our teacher teaching us math while rapping very fast

[@mikinzycote9386]

😂

[@v3rycherrybomb]

Lmao yesssss

[@rehmanahmed7466]

Trueee

[@jerson4365]

fr

[@priscilaherrera6640]

This is so unbelievably helpful 😭 I'm crying because his 2 in the morning and I've been stuck in this homework for the past hour and it took me only 2 minutes to understand with him.

[@blxzing1201]

Omg same

[@mxlky9187]

Me right now

[@andrewgarcia188]

sadly yes not knowing what to do no progress more than three hours with it being after midnight made me depressed and I broke luckily this guy can teach

[@yemixakin]

Ogeyand

[@michelleelliott4402]

this makes so much sense now. why can't my math teacher do this

[@nytrowgen2889]

+michelle elliott mine too

[@JeffnasticsPvP]

+michelle elliott SAME

[@Hello-cs2bv]

+michelle elliott It's like the teachers know this, but they suck at teaching and because of that, they have to help other students and the teacher doesn't have time to help you.

[@jimkeller3868]

+michelle elliott I think most teachers DO teach it exactly this way, and this clearly. There are 3 things I believe most people don't consider when thinking this is somehow a clearer explanation: 1) you're in a completely different setting. At home, relaxed, later in the day so perhaps more awake. 2) You can stop the video and replay it or you can stop it and think about it. You can't stop the flow of time in your classroom. In this respect, there is less pressure. 3) you are learning alone. There is no peer pressure, the feeling of embarrassment if I ask a dumb question. There are less distractions and concerns about other students or your teacher. The above content is not four-dimensional tensor calculus. It is straight forward and fairly easy to teach.

[@Cluetube]

+Jim Keller i actually kinda agree with Jim. but at the same time i kinda dont. but since i cant really put my reasons why i cant into word form. ill just leave it at JIMS RIGHT.

[@Jessicanimation]

10 years later and I'm relying on this channel for basic algebra.

[@wacky4159]

same

[@dark_fury1595]

me too

[@derrickhess928]

Without khan academy I would be failing algebra

[@lpsdarlingdevil2535]

Derrick Hess like me

[@bigsmoke6086]

I’m surprised I’m not failing

[@katzy9218]

Same!!

[@latonyagriffin5811]

I already am

[@emmasmith971]

I’m 2 or 3 points away from failing 😂

[@Mar-om6ct]

the traditional school system is soo old and makes things so hard, and the teachers only explain once and expect us to know everything, but every student has different needs

[@Mar-om6ct]

@Anime Watcher 🖥 🍿 replying after two years 😂

[@Mar-om6ct]

@Anime Watcher 🖥 🍿 replying just after I wake up 😂

[@AshmewStudios]

@@Mar-om6ct nice

[@Mar-om6ct]

@@AshmewStudios early reply

[@AshmewStudios]

@@Mar-om6ct good job

[@abhithegod1046]

time:1 hour to algebra test teacher:you guys have 1 hour to finalize your studying me : i need 9:20 minutes only

[@boislaya9810]

Soooooo khan for president or what? I never have wanted to thank someone more, Thank you!

[@nickyy.333]

I've been struggling in my math class for many days trying to understand and this helped me understand it so quickly. Thank you!! 😭

[@minimage1055]

Are you in 9th grade?

[@KNGallen]

@@minimage1055 grade 10 academic 😭

[@minimage1055]

@@KNGallen I’m going to grade ten next year, how is it? Ac math

[@KNGallen]

@@minimage1055 it’s definitely challenging but I’m finding it so far much easier than grade 9. Might just be my teacher who made it so hard in grade 9 but if you stay on top of homework you should be fine.

[@minimage1055]

@@KNGallen thank you so much, I’m really good in school I just have so much anxiety haha

[@ezthelegendary8441]

i hope this guy goes straight to heaven. he helped me through middle school school and still helping me in high school. thank you khan

[@sashaanand8714]

Thank you so much. This video has saved my life!!! I was absent from school today and our homework was on this topic. When I tried do do it I was lost. Thanks to this video I now understand it. Way easier than I thought!!!! Thanks again, Khan Academy!!!!😀

[@nebulai9587]

You're welcome. Even 5 years ago

[@Ryan-sm5sw]

Hows the adult life bro

[@smajerboy25]

@@Ryan-sm5sw maybe not so good o.o

[@jayhawkkgames3434]

Learned more in a minute of watching than 50 minutes of pre algebra tbh

[@tati.5664]

same!

[@matthewawaldrep]

This video is pure gold.

[@briankim49]

This is better than gold!

[@HBoywasdocile]

Brian Kim better

[@dark_fury1595]

khan academy helped me with my understanding of math, the way my teachers explains things confuses me meanwhile, khan academy actually explains and goes directly to the point, please donate to them so they can help students like me understand and learn math

[@Kingzach01]

Thank you Khan Academy for helping me not fail algebra. 👍👍👍.

[@yourneighborhoodana4584]

Thank you so much. In fifth grade my teacher was teaching my class 7th grade math and I would have failed if not for you. So far in eighth grade these videos are helping as well!

[@mariammozham5533]

I still dont get and I have a test and monday.I hate math

[@GrubworldLinearMusicChannel]

+Mariam Mozham Khan Academy is making me solve it easier than my math teacher..

[@chrisandboyz77]

Mariam Mozham me too

[@ryll5277]

they problemly got you confused by them subracting by 2y on both sides, but relly its easier to solve by subtracting x on both sides then get y alone by dividing the 2 by -x+9

[@deletedchannel2659]

Mariam Mozham me too... i still don’t get it

[@jayfml2243]

what'd you get on the test on monday?

[@sk8rmonkeys91]

dude!! thank you!!! i spent an hour staring at my book and going through useless vids, but yours is dope!! you earn my subscription!!! i hope you find money on the street as you walk.

[@sarahlusignan4751]

I was struggling so hard on this in class, but 2 minutes into the video and i already understand. THANK YOU!!!!

[@Lizzygaming101]

Can you help me with an equation and explain to me how it works bc I'm still confused bc either way if you put the x or y on the side of the equation by itself it still has a number in front of it and I don't understand

[@tejassraveendran9370]

I got a 91 in my Math Exam with he help of this video, thank you!

[@Spacey75257]

I have a review packet in 8th grade for things from 7th grade, but some are new that we’ve never done before, and some are too complicated to remember over summer, so this is a lifesaver

[@PrimeQualitySports]

That's one great explanation. No steps were missed and each step was explained. Some teachers skip explaining certain steps assuming that the student already knows about it but they don't.

[@askaksa6385]

I don't know if the people from khan academy know that they are actual gods that have saved so many of us. From the bottom of my heart, thank you.

[@shinigami-scythe5874]

omll thank you so much im currently in the process of doing homework over winter break (long story) and since the teacher isnt here this helped so much thank youuu :DD

[@ilikepizza2020]

I have my state exams tomorrow, and I have to pass in order to receive a high school diploma. I'm quite nervous, so I'm reviewing. Thanks for this video!

[@maverick885]

Did you pass?

[@iceaspect7591]

@@maverick885 bro i was wondering the same

[@manicpixie8672]

Did you

[@ilikepizza2020]

Evelyn McNaughton yes, I did pass! I’m graduating this year!

[@ilikepizza2020]

Ya boy Mav yes, I did. Sorry for the late reply.

[@Seattle206723]

Very useful, and displayed. Wish you were my math instructor. Well you are, shall we say. Thanks again

[@HP-fj2mi]

Great explanation! I'm glad I was able to find this video.

[@ZavryNelson]

this man I found on the internet taught more than my actual math teacher...

[@beatrizvaldes2839]

it's 2 in the morning and I'm studying last minute for a test I have first period...

[@ethanatorism]

Join the club

[@dbell1911]

Beatriz Valdes yep mines second period tomorrow :((

[@allit2190]

Beatriz Valdes me to

[@Evelyn-rg2nx]

same

[@landendrake1696]

Same.. except i'm doing it a year later lol.

[@rauldanted9652]

Life saver, my teacher can't barely explain clearly, your awesome

[@abrahamsolorio7906]

HOW TF IS THIS GONNA HELP ME IN LIFE

[@seb7202]

Math is the language through which you understand physics, and physics is the study of how this physical world moves and behaves. By extension, since physics shows how objects in motion behave, it also has many applications in every other kind of science. So if you want to work in a stem field, be a doctor, a vet, and hell a sniper for the military, you need a solid math background. There are also many other jobs in finance and business that require basic to advanced mathematics. Not only that but our everyday lives are heavily impacted by discoveries in stem, technology is typically the lens through which we see the world (for example engineering and technology which is heavily math based influences how well doctors can see your cells ie microscopes thus mathematics has saved your life by allowing advancements in the medical field with this new knowledge of cells). So really how has it not already helped you? tl,dr unless you want it to, it won’t.

[@matthewwurster1133]

Nice explanation

[@luidnathan5311]

@@seb7202 Good one.

[@abdalrhmansalman7225]

It wont :) This is the schooling system

[@manicpixie8672]

We'll say life has ten apples ......

[@IvanThaTerrible99]

this really helped me alot in algebra. Khan is a genius.

[@silvershi414]

bruh he sounds so excited his energy really makes me want to learn

[@sakuyaizayoi9876]

My teacher Mr.Richards recommended me here, because I had a F, but he knew I was trying. This helped mate! (There is multiple Richard's in the world so I didn't censor it)

[@drludbA]

Khan Academy in 10 minutes > 11 hours of class time

[@cat_jk00]

Sal's a bad ass wizard man who conjures the simplest thing ever out of thin air. Magic.

[@penguiz23]

Thanks, my math teacher taught us a method that made absolutely no sense at all; this helped a lot- thanks this saved me.

[@Mero-lz9bo]

ALLAhuAkbar BISSSMALAHAH, Sal Khan, may ALLAh bless you, habibi

[@antoniaorduno2396]

Love your videos . You explain it so much Better . God bless you . 🙂🙏

[@lasagna8964]

Oh my god I actually get it now! I’ve been trying for like a week but EnVision math isn’t any good. Thank you, Sal Khan

[@MehkaiManzano]

khan academy is the hero we need during quarantine, but not the hero we deserve

[@ghassanalbabili2407]

THANKS KHAN ACADEMY .BEST MATH TEACHER

[@drludbA]

Khan Academy is goated

[@vedarthkondapally6042]

LETSSSSSSSSSSSSSSSS GOOOOOO I LEARN MORE FROM 4 MINUTES OF THIS THEN I EVER HAVE IN SCHOOL!!!!!!!!!!!!!!!!!!!!

[@rivaantyc6826]

the "sum of 2 numbers is 70, and they differ by 11" problem can simply be solved by a single equation with a single variable like this: x+x+11=70 2x+11=70, subtract 11 from both sides, -11=-11 2x=59 x=29.5 the smaller number is 29.5, the larger one is 29.5 +11= 40.5. Done. Not saying you video is bad, or anything, on the contrary, khan academy is really good, and you explain these things really good as well. Just saying that you could have used an equation that didn't already have a specific way of solving.

[@Jiraiya27]

Thanks a lot hope this video get more likes

[@TLZ1717]

This video makes this concept so much easier to understand. I am amazed :)

[@tinayang5750]

Literally, my math class is like an hour and 25 min, and I did not get what the teacher was saying, thank you sooooo much that now I know how to use this method!!

[@maddielentz3777]

you’ve thought me more my 8th grade math year then my actual teacher ever could have

[@akashrahman6169]

at last, i found some kinda math that im talking about..... thanks khan, it helped me a lot.... all the other videos were just an easy exapmle of how to do linear.......(bla bla bla) but this one actually helped me

[@BehindYouSir]

Thank you so much. At first I was having trouble in my class, but this video cleared it up excellently! Thanks again!

[@htorbecerra]

love how this is taught

[@brookebobbitt8061]

Oh thank god I found this, I have a test tomorrow and I was full on panicking but now I understand how it works!!

[@sugar2370]

This was actually really helpful. Better than all the other videos I've tried. I understand perfectly.

[@desanovinarts]

Wait so can you do either variable in the top equation to start? Also is both have a number next to them does that change anything?

[@_alphasierra4705]

Much much clearer than how all the others i have seen on youtube teach about it

[@brandynblehm2937]

This explained it better than my algebra teacher, Thanks! I subscribed to you.

[@xler12]

you're a better teacher than my math teacher in school xD at least you could explain how these things are done unlike my teacher

[@Rampage_Arrow]

11 years ago hows life

[@nenecoulibaly549]

Sal Khan is a good man. Thank God for Khan Academy.

[@BEASTLEGEND21]

i have been struggling with the subsitution method and now i understand it . THANKS KHAN

[@hongrand]

Khan Academy is God's sent angel.

[@jayfml2243]

Philip Birgenheir is our God. Join our community and subscribe to him

[@sagittariusbeauty]

Thank you for explaining this 🙏

[@jessiemayfield6749]

At 3:18 where did the 11y go? Like he just skipped it I'm confused

[@Sunnythecat_098]

Ill explain. So Because the 6 and the 5 have "y", a "y" and another "y" cancel each other , leaving behind just a singular "y" As in 27-y=20

[@imswiiftz730]

Khan Academy My teacher sucks she is so bad doesn't even care/help this helps she rushes in the 50 mins of. Class I hope this helps me for my quiz tomorrow on this Thanks KHAN

[@heylosersaykidbackwards9021]

my teacher doesn't suck but shes AWEFUL at teaching students. she talks way to fast and writes really fast and at the same time you also have to be ready to answer any questions that she throws at you in the middle of the class during the notes. HIGH SCHOOL IS TOUGH :(

[@TacoMastersAssociation]

I have to retake a quiz now because I was absolutely stumped. I wish I discovered this earlier on, though. High School sucks.

[@simplystrawb]

This literally helped so much and saved so much more of my time so thank you

[@Izzyhiphop147]

@gointosleep Mr Khan : uses his head Teachers : Uses teacher book

[@eel7349]

During the pandemic we have half of our classes online and the 2 days I had in class to ask for help in math we’re cancelled and the test is Monday, thanks for these vids

[@BigMan10847]

Thank you. I was stuck on a problem for a solid 25 minutes this helped me solve it

[@georgedavistube]

you are a very clear and understanding teacher, I love your videos

[@AircrewAcademy]

You are a life saver Sal. Allah bless you. ❤

[@EmmyKhan]

and whoa, this just helped me understand it all instantly when it comes to the substitution method. Thanks from Sweden =)

[@a_smiling_gamer9063]

8:44 Apparently this solution also works 70 - 11 59 / 2 = 29.5 29.5 + 11 = 40.5 Quick check: 40.5 + 29.5 = 70 Version with variables is better but if you want to understand a different solution then here you go

[@pumpkinlover2102]

honest to god just studied for my math provincial just from watching these videos, learned way more than a full semester of math class

[@eminso2102]

Wow legit can learned anything from these videos, thanks!

[@teresa3861]

I learned from this video (,: Finally, KZbin has a purpose!

[@bashirgagigi172]

Thank you very much really appreciate your great and unique work

[@spencercavan8745]

how do you know when you can multiply by -1 to make the 7 positive, would -7 be wrong?

[@ayelelleososole4588]

Kind of, the y can’t be negative. That’s why you multiply it by -1.

[@ballisticpug6764]

Watched this mid test while on Zoom. Thanks so much

[@williamnefalar858]

His voice is so understandable

[@sleepyidot]

10 years later and this guy is still the reason im passing algebra

[@lubaleong9619]

Thank you very much for this super helpful explanation. I'm going to try redoing my math homework now...

[@rehmanahmed7466]

Thanks a lot khan academy, now i can actually do my home work 😊

[@trusei]

thank you now i can go to the exam

[@FiierceGaaming]

i love how my teacher explains this for weeks and i dont get it, then i watch this and understand perfectly

[@Rampage_Arrow]

10 years ago man how is life

[@brandon-sr4ld]

khan academy is the reason i have an a in math, thank u so much man

[@luidnathan5311]

Thank you Khan Academy, you are the reason math is very easy.

[@cappyy8597]

This video was very very helpful, Thanks Khan

[@harrietiscoolll]

my brain is slowley entering an endless paradox of confusion and pain

[@zainab2737]

Felt😭

[@Daski69]

the fastest solution to the word problem would be: x + x - 11 = 70 2x = 81 x = 81/2 x = 40,5 and the other number must then = 40.5 - 11 = 29.5 still, this vid was super helpful Khan is the closest you get to Buddha

[@sebs5027]

BRO YOU SAVED MY LIFE, THANK YOU SO MUCH, you explained this better in 10 minutes than my teacher could in 2 weeks

[@CBDToTheRescue]

God damn, never have I understood something so clear

[@jensonee]

you're breaking my brain!! thanks.

[@imanuppena]

Oh my gosh you are the best teacher. This helped me soooo much!!!! Thanks :D

[@new-gacha-riddles-jp]

Thanks, you explained a 1-hour long math lesson in less than 10 minutes.

[@Wingx0]

Khan Academy: thoroughly explains everything and WHY you do it. My math teacher: Don't do this, it won't work.

[@Abel_la_Abel]

That's amazing, creating numbers from just thin air (almost). I found Thai very helpful especially since I'm studying for sats

[@Gammer-xd3bh]

BRO THE BEST way I learn is Khan Academy FR!