Algebra Help: Distance Rate and Time

[@celtboxer]

I'm taking the GREs in a few weeks, and it's been almost 30 years since I've taken a math class. Your explanation is very clear. Thank you!

[@jessepiazza2106]

celtboxer how did it go?

[@Treblaine]

wow, youtube is the gift that keeps on giving. Smashing channel, subscribed and recommended.

[@s3rino]

Great, it really helps me study math without having to look through my book. Also, great voice, it's easy on the ears.

[@Fordguy1997]

@VickyJ31520 to get 9x, he added 3x and 6x together. since -30 isnt a like term he has to move it to the other side. to get rid of -30 on the left side, you add 30 to it and get zero. on the other side however you get 1080. To move a number to the other side always remember to do the inverse operation. since -30 is subtraction of 30, add 30.

[@lilbaboo2]

HOLY SH!T. It's MR. CLEAN. THANK YOU

[@outlawz1351]

A lot easier than I thought it would be, keep it up!

[@Glamrgrl104]

This is so helpful. I always have had problems with word problems this is easy to learn this way.

[@zk_c8076]

this video is so old, older than me, but this still helps me, thank you i have a exam on algebra today

[@ProfMark]

"10 less than 2 times", means to multiply the speed of Jet 1 by two, THEN subtract 10...so the correct formula is 2x-10.

[@strawberryseason]

@AceEliteProduction If we let x = the usual speed, and y = the usual time it takes to drive that distance, I can set up an equation (x--8)(9+2) = 140. Since there are two unknown variables, the only way I have found to solve this problem is to substitute values for the variables. I tried to find factors of 140, which are eight units from each other. The problem solution: 28 km/hr is the usual speed, and 5 hrs is the usual time. The slower speed is 20 km/hr & to drive 140 km takes 7 hrs.

[@Debedeb]

THis Guy is great . Thanks for explaining everything so we know why we do what we do and what to look for . perfect ;D

[@strawberryseason]

@AceEliteProduction I figured out a way to set up the equation.. Have x equal the usual speed of the car, & 140/x is the usual time it would take to go 140 mi. The initial equation is (x -- 8)(140/x + 2) = 140 Solving this problem involves factoring a quadratic equation. If you work the above equation, you eventually get the following: (x + 20)(x -- 28) = 0 To solve then, the only value that works (is a positive number) is 28. Thus, the usual speed of the car is 28.

[@chillndylan6058]

great job explaining this

[@davidbirkner6258]

Can you be my math teacher? you made this so easy.

[@marshandomness]

do u happen to have a video on scientific notation?

[@VickyJ31520]

@idancefun23 I thought that at first as well but then I "THINK" he solved as the problem read's that you would soon have to subtract the speed which is less then ten less than two time's the speed of the second jet after you figure out the distance of the first jet. but I don't understand if he added, subtracted, multiplied or divided from the equation of tacking on 30 to both sides of 3X and 9X to equal 1080? I've been pondering on that for the longest!

[@gpratts06]

wow.. i always have problems wit this type of stuff.. thank u so much.. u made it so easay..now i understand it. thanks!

[@iflyc77]

way better than what my teacher did, thanks, i get it this time

[@johncharipurathu]

Thank you Doctor Emmett Brown

[@01JH]

Why does the distance between jet 1 and 2 need to be added when it sais "apart"? That sounds like the difference or minus.

[@lisabianchi2910]

You've made this very clear! Thank you!

[@MrMattias87]

yeah I've watched this numerous times and I've been practising some algebra formula's too. so now I understand this clip. but thanks anyway mate.

[@ccowser]

Excellent Presentation!!! I also use a table and have students to write a complete sentence.

[@uabm]

Why wasn't the speed of the first jet set up as 10-2x since it says 10 less then 2 times the speed of the second jet. Why was the order switched around.

[@01JH]

@migueche20 UGH! You're right. Not reading carefully. If the planes were flying in the same direction then you'd subtract right??

[@gibsonsg63]

thanks for such clear instructions!

[@christianjensvold2571]

IT ALL MAKES SO MUCH SENSE NOW

[@reformeddefence]

How did he get to the 120? I know that he divided 1080 by 9, the statement he made was you add 30 to both sides which i don't understand

[@s0nofgods]

this helped me thank you!!

[@passgyalsiakam]

Thaanks! :D I needed this

[@magemager0]

thank you so much, unfortuneatly my math teacher doesnt teach us, he is intimidated by out class, i do not know why, all we really do is review our homework and we sit there while he begs us to behave, it frustrates me to no extent, so ofcourse i look to youtube, and i found it !

[@tiffcatz]

but what if you dont have the distance they are apart (like in this problem its 1050 miles) ??

[@carlnunez11]

Very profesional explanation!!!!!!!!!!!

[@emily-ix9wk]

thank you so much! This is great

[@typhonfighter]

Great video! I learned pretty much. And the "Teacher" Was really good!! Better than my math teacher, he's a *****

[@VickyJ31520]

I don't understand how that equation was solved in 6X-30+3X9X-1080, did he simply add,subtract, multiplied or divided from the equation of tacking on the 30 to both sides of 3X and 9X? there is obviously something I missed there.

[@CatfishCameras]

What are you taking about?

[@onionhole]

Can someone send me a proof of this? That d=rt. I can't find one.

[@vm25257]

GREAT!! Thanks!! I've subbed

[@H2oFormula]

Clear and brilliant.

[@CookiesNCream4ever]

Dont you minus 30 from both sides?

[@migueche20]

@01JH because you want to find the total distance apart.

[@trshkryll]

where did the 2x-10 came from?

[@kkuracafe]

it's in the given word problem. "ten less than two times the speed of the second jet"

[@migueche20]

@01JH you got it

[@quishia]

Great video! :)

[@jamesivan24]

Solved! You guys rock!

[@coolkarl182]

GREAT!! THANK YOU!!

[@MrMattias87]

I dont wish to be a dick, but should'nt jet 2 be 230 mph and jet 1 be 120mph?. it did say in the question that the speed of the first jet is ten less than two times the speed of the second jet.

[@Foofoo2688]

Thank you so much!

[@euclotan]

thank you sir.

[@isabellanewman8511]

Thanks you very much!

[@janemitchell5812]

thank you.

[@strawberryseason]

@dontdodrugs666 That is the way that I did it, too. Very easy to do that way.

[@majch]

This is great, what if you try to solve the problem using minutes? You'd SHOULD get a speed of 2 miles per minute for the slow jet, and then insert in the fast jet equation which would give -6 miles per minute. Obviously this doesn't make sense. O.o Can someone solve this problem using minutes?

[@deeman1019]

I having problems with this algebra

[@MrDrUmM3r519]

thanks

[@bluemoonann]

I UNDERSTAND NOW!

[@DinoNucci]

I want to hug you

[@kidstar87]

That's gay Dan

[@DinoNucci]

Colin Webster ? Why is that related to you sir?

[@laysa713]

thanks a lot!! :D

[@andrewfraser546]

Nice...logical :)

[@kiara12396]

why can't YOU be my math teacher :(

[@moreno619531]

no, jet one can't be 120 mph because it says in the problem that the first jet is 10- then 2 times more of jet two which is 230.. watch the video carefully..lol

[@farheenyousuf6199]

👏👏👏👏👏👌👌👌👌

[@CatfishCameras]

my teacher did this and I was confused. then I came here and now itz betar.

[@iAmJoFlo]

Make another table... named Jet Li

[@ydultm]

dam im smart i already knew this =]

[@fredpatrickgaines4138]

listened 5 times

[@5104560711]

geez louizzzzzzeeeeeee

[@HorsesRock307]

why are there no top comments lol?

[@fjordtru]

you'll be old too -_____-

[@mike02601]

you're wrong teacher....jets don't fly that slow....;lol.....

[@luiscruz5007]

Easy for you to say! JK u tha man :-)

[@jovanni89pliskin]

is this guy dead by now?

[@---lq7id]

jovanni89pliskin No. are you?

[@surkhab324]

thanks