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OpenStudy (anonymous):
Solve using matrices. 9x-5y=51 4x + y = 13
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hero (hero):
y = 13 - 4x y = (51 - 9x)/-5 y = y -5(13 - 4x) = 51 - 9x -65 +20x = 51 - 9x 29x = 116 x = 4 y = -3
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