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Math Help - Accounts+Percentages+Elimination/Substitution

  1. #1
    Junior Member fluffy_penguin's Avatar
    Joined
    Sep 2007
    Posts
    39

    Accounts+Percentages+Elimination/Substitution

    My last problem I'm going to ask help with for today at least.

    http://img81.imageshack.us/img81/5207/p8dn5.jpg

    I set it up as follows:

    x+y =34000
    7x+8y=2530

    -------------

    (-7)x+y =34000
    7x+8y=2530

    -7x-7y=-23800
    7x+8y=2530
    __________
    0x+1y = -235470

    That just doesn't seem right, a person being in the whole for way more than they invested.
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  2. #2
    Newbie
    Joined
    Sep 2007
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    I think this is the problem. 7% and 8% do not equal 7 and 8. Try plugging in .07x + .08y

    Your answer should be 15000. Don't hold me accountable, though.
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