Question

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

Answer 1

One thing that is obvious is that x = x that would mean:
-3y + 12 = -y + 2 Do you see why?

Answer 2

Now solve for y
2y = 10
y = 5 algebra

Now substitute 5 for y and solve for x.