Inequalities using addition and subtraction | Linear inequalities | Algebra I | Khan Academy

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Inequalities Using Addition and Subtraction
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Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.
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[@Bear-sk3nx]

Seriously? It's that simple?! It's taken me forever to figure this out and all you have to do is balance it out and isolate the variable. Great video, really helped! Thanks!

[@TacoMastersAssociation]

You're a late bloomer too, just like me. Haha. This video totally helped me out.

[@rawaaalnatour1744]

في وهج رح رندة وعمراني ليش مصدر

[@rawaaalnatour1744]

صيدا

[@rawaaalnatour1744]

ليش

[@JOOT49]

This Gamer teaching me more then my math teacher ever could during the quarantine.

[@avudgw]

bruh same😭

[@lilit905]

Khan is a GIGA chad, ultimate youtube math teacher

[@Swirlypuff0]

Quagsire!

[@shep6489]

I get it now, I know everything now..... Now I shall use this to take over the world...

[@corupptedkev6032]

lmao wtf

[@matthiasrattansingh6775]

🤔😂

[@lizycardenas6686]

No offence to my math teacher but, you are WAY BETTER at teaching math

[@adamdaoud8497]

True honestly

[@Bro-bv4rw]

Well ye

[@Min-dq2je]

lizette cardenas U said this cuz u hate ur teacher 👩‍🏫

[@jokersgrin3061]

teacher sees the comment Next day: teacher: 1 year detention 10 years in jail a fine of 1m dollars 20 laps around the oval toilet duty for 2 years and the hardest thing of all EXTRA HOME WORK

[@crazyanimators5473]

#BetterTeacherThanMyActualTeacher Thank you, Khan!

[@hatimlaaroussi642]

Thanks! my teacher made this sound more complicated than it actually is.

[@navidrashid8573]

😱 AMAZIN THX WAS LATE FOR SCHOOL A BIT AT 8:07 SCHOOL STARTS AT 7:20-7:50 Thx 17 min lol

[@goldencheese155]

YEAH CHILL WITH THE CAPS :)

[@Osonola]

I was stuck on my homework till' I found out this video. Thanks!

[@chrome1018]

10 years ago, how are you doing man?

[@Osonola]

@@chrome1018 Day 3652 and I haven't used this yet But I did graduate and now I am (finally) working as an audio engineer

[@amaldjibo1319]

I was sick today math teacher gave me my homework before I left school now I'm #Golden with this topic!!!!!!!!!!!!!!!!!!!!

[@rawaaalnatour1744]

😇

[@brhantesfay4511]

Khan Academy is the best academy in quarantine

[@x0t094]

Thanks this helped me in my test

[@yass583]

Aaa thank you so much! It looks much more easier! I couldn’t understand the book! Your a really great math teacher!👏👏

[@xzarcyu2910]

You are my savoir of my grades you are way more more better at teaching math, I learned a lot

[@pusheenheart312]

tfw your teacher never talked about this at all and its in the exam and the book has little no information thank yu so much!! this taught me better than my mom did

[@fatemaa6107]

ok, so im not suppose to be learning algebra but im just studying it and want to learn it. So, I don't get why you subtracted or added some number in both sides... Why cant u use another number? why cant we subtract and not add?

[@holdthatlforluigi]

You can use both subtraction and adding. The idea is to remove all the 'baggage' so that x, p or whatever variable you are using is the only thing left on both sides. Some examples: 7+ c > 21 We want 7c to just become c, so we must subract 7. We will also subtract on the other side to keep the inequality true. c > 14 f - 5 < 98 Because 5 is being subtracted, you must add it back to get f f < 93 Hope this helped... If not, I apologize.

[@TheLiZabe89_Cherry_O4kz956]

I just needed to refresh my memory. Thank you, sir... You explain very well!

[@lilit905]

This man is a giga chad! (Giga chad means a really cool or nice person that helps others, has respect for other people, makes things more understandable, etc)

[@tristensenecal9550]

Thanks a lot it makes sense now

[@shontalefreeman9801]

Helped me in class (: thankss .!!

[@green5030]

This is awesome tysm man

[@leewilson3084]

that helped me understand better

[@accessmathtutoring]

Excellent ! ❤👍

[@slicks8152]

Iva had like 4 exams on this topic and i got like f in all of them and this man just helped me get the whole thing

[@goldstein23]

There's a common, counter-intuitive error at 2:50. Sal says that 39.99 repeating is in the solution set of x < 40. This is not true. 39.99 repeating is not close to 40, it's exactly 40. A good, short, discussion of this counter-intuitive idea can be found in UMKC's College Algebra Lecture 1 beginning at 1:15:10 watch?v=1Amt_-uB9QQ

[@randums.9229]

I get it now! This is way easier than what my teacher teaches ty

[@jozef.08]

I find this way more simple

[@rinapotter6365]

THANKS SO MUCH THIS HELP ME IN THE EXAMS .... THANKS

[@rawaaalnatour1744]

how much is this one

[@AwakenPlayzRoblox]

Helpfull

[@fortfff4936]

me: tries to understand what my teacher gave for homework 1 HR LATER me: sees this vid... finishes homework in 0.0000000000009 secs

[@lilit905]

Your mind size goes from planck length to observable universe after watching this

[@jenniferkim9378]

You are the best

[@Akira-fr2yt]

How do you do X - 3 < -4

[@importantthings7047]

X < -1

[@ishraqalyas218]

Simple. Add 3 to both sides and you get: x < -1

[@Bakonsfield]

thnx

[@brodyheel7803]

How do you solve it if it is like this 35>5-x

[@matthewcupelli5901]

still add -5 to both sides in order to isolate the variable

[@ef1103]

@@matthewcupelli5901 don't u understand what he was trying to do u took an extra year for you to answer him

[@ykpaulinee]

@@ef1103 💀

[@salhosa]

This video made me realize how my math teacher makes everything harder than it actually is like why though 😡

[@Alvoreyxx]

you must be a teacher

[@YevgenYampolskiy]

What? 39.(9) is less than 40? By how much? By 0.(0) ?

[@kingofdice66]

I agree,I'm sure he didn't meant that, he didn't realize his mistake in this video.

[@kevalamin8710]

I thought google was a website

[@devomboyz6983]

+Keval Amin It is an website

[@zuesr3277]

+Devom Boyz search engine

[@x0t094]

Wait so how do you solve 2x

[@ishraqalyas218]

Divide both sides by 2 and you get: x

[@latoya6681]

School life

[@Dylan-qc4lj]

OMG I LOVE YOU LOL EZ PZ MATH HW

[@kaidenknowles2067]

lol who in 2020 watching this bc of online classes.

[@goh5t]

WHERE ARE THE 3 NUMBERS NOW IM STUCK ON MY HOMEWORK!!!!!!!!!!!!!!!!!!!!!!!!!

[@lilit905]

F

[@BLU3B3RRY_B4LL3D]

Either my teachers are teaching me wrong or this is wrong cause idk man, im in intermediate (Middle school but with only 7th and 8th graders im guessing) and idk Edit: I actually wtached the video further and its correct so yeah thanks for the info khan (idk if thats your name)

[@vuthangvuthang2147]

the video image is too poor, you need to fix it more

[@lilit905]

Theres a thing called quality settings, click the three dots above, then click quality, and choose your video quality! Youll be able to see the video much better!

[@escopetaplayer]

Ate very horrible