Solve each system by the addition method.

1 answer:

7 0

-4x + 7y = 9 ⇒ -4x + 7y = 9 ⇒ 8x - 14y = -18
2y = -5x - 22 ⇒ -5x - 2y = 22 ⇒ -35x - 14y = 154
 43x = -172
 43 43
 x = -4
 -4x + 7y = 9
 -4(-4) + 7y = 9
 16 + 7y = 9
 - 16 - 16
 7y = -7
 7 7
 y = -1
 (x, y) = (-4, -1)

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