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Math Help - solving simultanous equations

  1. #1
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    solving simultanous equations

    Thanks!
    Last edited by oli212; March 2nd 2008 at 03:25 PM.
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  2. #2
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    Quote Originally Posted by oli212 View Post
    Hi, i have two equations which need to be solved for X and Y.

    2X + 1.5Y = 300
    X + 1.5Y = 210

    Not too sure how i should go about this.
    Subtract the second equation from the first giving:

    X = 90.

    Substitute in 90 for X giving: 90 + 1.5Y = 210

    1.5Y = 120
    Y = 80.

    X = 90, Y = 80
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