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OpenStudy (anonymous):
substitution method -7x+2y=18 6x+6y=0
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hero (hero):
6x + 6y = 0 3(2x + 2y) = 0 2x + 2y = 0 7x - 2y = 0 9x = 0 x = 0 -7(0)+2y = 18 2y = 18 y = 18/2 y = 9
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