Solve by the substitution method.

3x+8y=57
x=67-8y

2 answers

3(67 - 8y) +8y = 57
201 - 24y + 8y = 57
144 = 16 y

You finish it. Divide both sides of the equation by 16.
Solve by the substitution
8x+3y=-18
-4x+y=14