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OpenStudy (anonymous):
Solve by substitution y = 2x + 7 4x − 3y = −9
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OpenStudy (anonymous):
4x - 3(2x+7) = 9 since if y = 2x+7 you can simply replace the y in the 2nd equation with what y is in the first then rules of solving for x 4x-6x-21=9 -2x=30 x=-15
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