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posted by Jennifer Tuesday, July 26, 2011 at 6:56pm.

solve by the substitution method 5x+7y=6 -6x+y=21

from the 2nd ---> y = 21 + 6x plug that into the 1st 5x + 7(21+6x) = 6 solve for x, then sub back into y = 21+6x

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