Solve using substitution
-3x + y = -2
y = x + 6
Subbing the second equation into the first
-3x + (x + 6) = -2
-2x + 6 = -2
-2x = -2 - 6
-2x = -8
x = -8 / -2 = 4
y = x + 6 = 4 + 6 = 10
