1 Answer

Kean Amaral · Answer 1 · 2016-12-03T13:05:14+0000

-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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