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21-10-2016
Mathematics

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y - x = 9 and 8 = -2x - 4y
(solve for y)

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21-10-2016

y - x = 9
-x = 9 + y
x = -9 - y

8 = -2x - 4y
8 = -2(-9 - y) - 4y
8 = 18 + 2y - 4y
-10 = -2y
10 = 2y
y = 5

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