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30-11-2017
Mathematics

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-x -7y = 9
-x + 9y = -23

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tynollette tynollette

30-11-2017

subtract the equations to eliminate x:
9y-(-7y)=-23-9
16y=-32
y=-2
plug y=-2 in either of the equation to find x:
-x-7(-2)=9
x=-5

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