Question

6x-3y=21
2x+2y=22
elimination by multiplacation.

Answer 1

Multiply the bottom equation by -3 and add the result to the top equation.

Answer 2

-6X+6y=-66

Answer 3

Well what do you mean by eliminate by multiplication?
What I did was I set it up so that you have:

6x-3y=21
-3(2x+2y=22)

this will give you
6x-3y=21 and
-6x-6y=-66

This system enables you to solve for y.
-3y-6y=21-61
-9y=-45
y=5

Now, you can just plug y back in to any of the 2 equations given.

x=6

Answer 4

thank you!