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Mathematics 10 Online
OpenStudy (anonymous):

x-8y=21 3x-8y=15

OpenStudy (p0sitr0n):

x=21+8y put back in equation 2 3(21+8y)-8y=15 63+16y=15 16y=-38 y=-2 then put back into first equation x=21+8(-2)=21-16=5 y=-2, x=5

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