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Math Help - Find derivitive of y wrt x on curve

  1. #1
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    Find derivitive of y wrt x on curve

    Not too sure where to start with this, any help would be great.
    I have calculated the partial derivitives wrt x and y, but think I am missing the formula where I have to sub in.

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  2. #2
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    Re: Find derivitive of y wrt x on curve

    Use "implicit differentiation". If f(x, y)= C (a constant) then \frac{\partial f}{\partial x}+ \frac{\partial f}{\partial y}\frac{dy}{dx}= 0. That is, \frac{dy}{dx}= -\frac{\frac{\partial f}{\partial x}}{\frac{\partial f}{\partial y}}.
    Last edited by HallsofIvy; April 11th 2013 at 05:41 PM.
    Thanks from topsquark and ducked
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  3. #3
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    Re: Find derivitive of y wrt x on curve

    thanks
    Last edited by ducked; April 12th 2013 at 10:17 PM.
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