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OpenStudy (anonymous):
-2x-9y=-25 -4x-9y=-23 Elimination
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OpenStudy (anonymous):
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OpenStudy (rulnick):
subtract the first equation from the second: -2x = 2 x=-1 back-substitute to get -2(-1)-9y=-25 2-9y=-25 27=9y y=3 so x=-1, y=3
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