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Rate of change

  1. Apr 22, 2007 #1
    If xy^2=12 and dy/dt=6, find dx/dt when y=2

    The way i thought to do this would be
    (1)(y^2)+x(y)(dy/dt)=0 but i dont know x so this isnt working, what am i doing wrong
     
  2. jcsd
  3. Apr 22, 2007 #2
    You just multiply the derivative of x with respect to y by 6(chain rule). You can find x as a fucntion of y by solving for it so x=12/y^2.
     
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