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Math Help - Solve by substitution - Help

  1. #1
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    Solve by substitution - Help

    I have to solve this by way of the substitution method, please help.

    1/5x + 2/3y = -73/5

    3x-y=12

    One more:

    5x+7y=15

    x=6-2y
    Last edited by highdrake; June 18th 2009 at 02:02 PM.
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  2. #2
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    Quote Originally Posted by highdrake View Post
    I have to solve this by way of the substitution method, please help.

    1/5x + 2/3y = -73/5

    (1/5)x + (2/3)(3x-12) = -73/5

    3x-y=12, solve for y ... y = 3x-12 ... substitute for y in the above equation, then solve for x

    One more:

    5x+7y=15

    5(6-2y) + 7y = 15

    x=6-2y same drill with x, then solve for y
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