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Math Help - Need Help getting started dy/dx

  1. #1
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    Oct 2009
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    Need Help getting started dy/dx

    Find dy/dx for:

    a) xy + 3y - 4 = 0

    b) 2x + 4y + y = 3

    How would you start this problem?
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  2. #2
    Member
    Joined
    May 2009
    Posts
    211
    Use implicit differentiation, so for ex. 1:

    [x^3(y') + y(3x^2)] + 3y' - 0 = 0

    then you want to keep simplifying and eventually isolate y' in one side, so you can end up with a function of the form y'=
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