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Homework Help: Simple rates problem

  1. Sep 14, 2008 #1
    xy=4

    dy/dt=3

    find dx/dt when x = 4

    I completely forgot how to solve something this simple.
     
  2. jcsd
  3. Sep 14, 2008 #2

    Dick

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    Science Advisor
    Homework Helper

    Use implicit differentiation. Differentiate both sides of x(t)*y(t)=4 with respect to t.
     
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