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    taybug1991's Avatar
    taybug1991 Posts: 1, Reputation: 1
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    #1

    May 28, 2012, 08:50 AM
    solve math problems by elimination
    7x+9y=40
    x=16-3y
    pready's Avatar
    pready Posts: 3,197, Reputation: 207
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    #2

    May 28, 2012, 09:14 AM
    For 7X + 9Y = 40 just substitute 16 - 3Y for your X. Now your equation = 7(16 - 3Y) + 9Y = 40

    Now just sovle for Y.

    When you solve for Y substitute your answer wher the Y is and solve for X.
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