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posted by Sam on Tuesday, October 12, 2010 at 7:56pm.
solve by the substitution method 3x+5y=21 x=51-9y
substitute x in the eq 3x+5y=21 3(51-9y)+5y=21 153-27y+5y=21 153-22y=21 -22y=21-153 -22y=-132 -22y/-22=-153/-22 y=6
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