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math

posted by on .

solve by the substitution method

5x+7y=6

-6x+y=21

  • math - ,

    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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