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OpenStudy (anonymous):
4x+7y=-80 3x+5y=-58
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OpenStudy (noorik.):
we multiply the first equation by 3, and multiply the second equation by 4, so the system will be: 12x+21y=-240 12x+20y=-232 then subtract the second equation from the the first (12x+21y)-(12x+20y) = -240-(-232)
OpenStudy (noorik.):
@Jasmineamy
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