I have to solve for x and y. Please help :)
2x-5y=10
-3x+4y=-15

Question

I have to solve for x and y. Please help :)
2x-5y=10
-3x+4y=-15

anonymous · Answer

multiply the first equation by 3 all the way across
multiply the second equation by 2 all the way across
then add them
the $x$ terms will add up to zero (cancel, drop out, whatever) and you will be left with only $y$ to solve for

anonymous · Answer

$$2x-5y=10\ -3x+4y=-15 $$
$$6x-15y=30\ -6x+8y=-30 $$

anonymous · Answer

add and get $-7y=0$ so $y=0$

anonymous · Answer

THANK YOU <3

anonymous · Answer

yw
don't forget to solve for $x$

anonymous · Answer

Oh yea..

anonymous · Answer

well shouldnt i solve for that first

jackellyn · Answer

You could solve for either one first, you just have to go back to solve for the other variable.

anonymous · Answer

But when I solve for the other variable do I use the other equation too?

jackellyn · Answer

Yeah, just plug in the answer you got for the variable you already found and then solve for the other variable

anonymous · Answer

oke

anonymous · Answer

you can do it with your eyeballs
if $2x-5y=10$ and $y=0$ you get $2x=10$ and so $x=5$

anonymous · Answer

:) thanks i completely understand