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Math Help - Finding equation of curve

  1. #1
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    Exclamation Finding equation of curve

    Find the equation of the curve COD assuming it is of the form y=ax^2n.
    C(-60,18) O(0,0), D(40,8).

    How on earth do i even do this question???
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  2. #2
    No one in Particular VonNemo19's Avatar
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    Quote Originally Posted by xwrathbringerx View Post
    Find the equation of the curve COD assuming it is of the form y=ax^2n.
    C(-60,18) O(0,0), D(40,8).


    How on earth do i even do this question???
    Plug in your points. This will give you tree equations. Then solve the system of thes equations for numbers a and n.
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  3. #3
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    Exclamation

    hmmm could you please show me how to simultaneously solve these...

    I've got
    18 = a * 3600^n

    AND

    8 = a * 1600^n

    which becomes 10 = (3600^n - 1600^n) * a
    Last edited by xwrathbringerx; September 26th 2009 at 03:09 PM.
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  4. #4
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    Quote Originally Posted by xwrathbringerx View Post
    hmmm could you please show me how to simultaneously solve these...

    I've got
    18 = a * 3600^n

    AND

    8 = a * 1600^n

    which becomes 10 = (3600^n - 1600^n) * a
    try dividing the two equations instead of subtracting them.
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  5. #5
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    Exclamation

    1I've got 18/3600^n = 8/1600^n but I dont know how to go about solving n ....I tried cross multiplying
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