Question

solve each system using elimination:
1. 3x+3y=27
x-3y=-11
2. -x+5y=13
x-y=15
3. 2x+4y=22
2x-2y=-8
thanksies

Answer 1

3x+3y=27
x-3y=-11
In this one, do you see something you can get rid of?

Answer 2

Here: http://puu.sh/qCxy

Answer 3

OHHH okay

Answer 4

I'm confused, what do I do with the bottom equation? I'm really lost with this.

Answer 5

In the second one,
-x+5y=13
x-y=15

You can see that there's a x and a -x, a y and a -y, do can use either, but they, I would suggest to transform the -y in the 2nd equation to 5y, how do you do that!? :O
Hint:
-y(x) = -5y
Solve for x

Answer 6

Here's the solution for the second one: http://puu.sh/qCzY
Now try to do the third one by yourself, keep in mind to find two similar terms but with opposite sign, good luck ;D
(P.s.: Don't forget to find y's value as well :P )

Answer 7

Thanks :D