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    Janellerhiannon's Avatar
    Janellerhiannon Posts: 2, Reputation: 1
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    #1

    Dec 4, 2008, 09:08 PM
    Implicit Differentiation - Calculus
    OK, so I'm familiar with implicit differentiation, but this problem is very difficult for me to solve.

    Find (dy/dx) for the equation: y = x/(x+y)



    PLEASE HELP!!
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Dec 4, 2008, 10:25 PM
    Do you know the quotient rule?





    Now, solve for y' and tidy up with some algebra.

    Can you finish OK?
    Janellerhiannon's Avatar
    Janellerhiannon Posts: 2, Reputation: 1
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    #3

    Dec 7, 2008, 10:05 PM
    Well, I got the quotient rule part down. It's just the algebra that I'm stuck on. I keep getting different answers.
    mathkid's Avatar
    mathkid Posts: 2, Reputation: 1
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    #4

    Feb 15, 2009, 04:13 PM

    You should only get one answer.

    If you are solving for dy/dx, try putting all of the dy/dx's on one side of the equation, and all Xs on the other side.

    Combine like multiples and then solve for dy/dx.

    :D
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