Question

Find the solution to the following system of equations.
x + 3y = 12
x + y = 2

Answer 1

Have you considered subtracting the second from the first?

Answer 2

Following tkhunny's suggestion:
x + 3y = 12
-x - y = -2
Now add the 2 equations.

Answer 3

Okay, I'll add the equations and get:
2y = 10

So y equals?

Answer 4

5?

Answer 5

Just for the record, I VERY MUCH recommend multiplication by -1 followed by addition. MUCH better than subtraction.