## Algebra: A Combined Approach (4th Edition)

2x - y = 8 2(3) - (-2) = 8 6 + 2 = 8 8 = 8 x + 3y = 4 3 + 3(-2) = 4 3 + (-6) = 4 3 - 6 = 4 -3 $\ne$ 4