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  • 25-10-2019
  • Mathematics
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−8y+9x=−5 8y+7x=−75 ​

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helpmewiththings49
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  • 25-10-2019
Elimination method:
(8y + 7x) + (-8y + 9x) = (-75) + (-5)
8y + 7x - 8y + 9x = -75 - 5
16x = -80
x = -5

Substitute x = -5 into 2nd equation:
8y + 7x = -75
8y + 7(-5) = -75
8y - 35 = -75
8y = -40
y = -5

Answer: x = -5, y = -5
Don’t believe me, you plug this values into each one.
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