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Math Help - Implicit differentitaion

  1. #1
    Junior Member
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    Implicit differentitaion

    Find dy/dx :
    (9/x)+(9/y)=4

    My answer is ((xy)^2 - 9y^2)/-9x^2


    My answer is not matching with the correct answer. Is it wrong ?
    Can u help me.
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  2. #2
    Banned
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    May 2009
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    Quote Originally Posted by kashifzaidi View Post
    Find dy/dx :
    (9/x)+(9/y)=4

    My answer is ((xy)^2 - 9y^2)/-9x^2


    My answer is not matching with the correct answer. Is it wrong ?
    Can u help me.

    \frac{9}{x}+\frac{9}{y}=4

    -\frac{9}{x^2}-\frac{9}{y^2}y'=0

    y'=-\frac{y^2}{x^2}
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