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OpenStudy (anonymous):
solve each system of equations by substitution y=2x+7 3x-y=-9
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OpenStudy (anonymous):
3x - y = -9 3x = y-9 Substituting y = 2x+7 in 3x = y-9 3x = 2x+7-9 3x - 2x = -2 x = -2 Substituting x = -2 in y = 2x+7 y = 2(-2) + 7 = 3
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