SOLUTION: solve by the substitution method 4x-2y=-30 8x+81=y

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Question 288008: solve by the substitution method 4x-2y=-30 8x+81=y
Answer by stanbon(75887) About Me  (Show Source):
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solve by the substitution method 4x-2y=-30 8x+81=y
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Substitute for "y" in the 1st equation:
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4x- 2(8x+81) = -30
4x-16x - 162 = -30
-12x = 132
x= -11
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Substitute into y = 8x+81 to solve for "y":
y = 8(-11)+81
y = -88+81
y = -7
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cheers,
Stan H.
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