Question

Resolva os sistema:{x+8y= -14 \ {2x -9y = -3

Answer 1

x + 8y = -14 (*-2)
2x - 9y = -3
______________
-2x - 16y = 28
2x - 9y = -3
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 //   -25y = 25
y = -25/25
y = -1

2x - 9y = -3
2x - 9(-1) = -3
2x + 9 = -3
2x = -3 - 9
2x = -12
x = -12/2
x = -6

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