systems of equations

Devestato72 Says:

Aug 16, 2011 - who cares?

HyperNovaTornado Says:

Aug 18, 2011 - How do you find the intersection of 2 curves without graphing?

klevdav Says:

Aug 21, 2011 - Wtf!!!!! Is this

moihancalsar Says:

Sep 8, 2011 - 5 ppl failed math

theicesarcontreras Says:

Sep 28, 2011 - I would usually understand your videos but this was the worst.

roboroborobodancer Says:

Sep 29, 2011 - Made perfect sense after first question. Really, thanks a lot!

Happyascanbe1 Says:

Oct 4, 2011 - In the last example you have multiplied the first equation with 4 to get -36y and 36y and you've got: -12x -36y = 264. Now, i just noticed that if you multiplied it with 7 instead to get -21x and 21 x, you would have gotten: -21x - 63y =462 and i couldn't help but notice the cool inversion of digits. How do you explain that?

nitrogif Says:

Nov 8, 2011 - would like to see this remade with colors etc.

activatupc Says:

Nov 14, 2011 - thanks i'm from Mexico but in my country doesn't explain like you :D sorry for my bad english (Y)

MrCIickHere Says:

Nov 19, 2011 - I'll agreed. These video really helpful

simplayaj Says:

Dec 12, 2011 - add 15 to both sides

Johnnylightning93 Says:

Dec 12, 2011 - thanks

XmayaXeliasX Says:

Dec 14, 2011 - okay. soo.. what about the 40???

TheSoccer16x Says:

Jan 4, 2012 - i love how this shows exactly what my math teacher is teaching me tomorrow..

vickiormindyb Says:

Feb 18, 2012 - Why didn't you just say 4 x -18, which comes out to -72? The sudden appearance of a 40 and some other numbers was - for me at least - totally confusing.

IconBeast001 Says:

Feb 23, 2012 - that was wrong when u got x it was supposed to be a positive

vickiormindyb Says:

Feb 24, 2012 - My broker friend helped me with the last problem. But he multiplies too fast IMO.He also helped with the first problem, which is how I understand where you got the -72 from.

jeremie0316 Says:

Mar 10, 2012 - you can set up a matrix and solve

myfreetime123 Says:

Apr 10, 2012 - Good video, except I think you should have mentioned the LCM for people who are new to this.

assasiner12 Says:

Apr 14, 2012 - 10 people are jealous of Khan!

organicmilk5 Says:

Apr 15, 2012 - 9:27 what if they dont cancel, what do you do then?

singleservingfilm Says:

May 19, 2012 - i got a question for the maths geeks on here..... if i am in the top 100 out of 10million what % am i ini think its 0.001 or 1100th of a % but i have no clue how to write it down lol

darklinkzx2 Says:

May 20, 2012 - I have one that's like this:3x-4y=12y= 3/4x-1and I get a 0 when I try to substitute y from the top equation with the bottom and try to factor out the x.

darklinkzx2 Says:

May 20, 2012 - I also have another one that I did get an answer to but it seems wrong. Don't know if anybody can concur if it's correct.2x - y = 6y = -4/3x+1I get : x=17/3 and y= -59/9

BigRed88291 Says:

May 24, 2012 - This really helped me on my final, thanks and keep doing stuff like this.