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Rate of change calculus?

  1. Jul 21, 2011 #1
    Hello everyone I have a two question


    my first one is differentiate with respect to t

    y=x^2-3x find dy/dt when x=3 and dx/dt=2

    This is what I did
    dy/dt=2x dx/dt (I am stuck right here)


    my second one is

    xy=4 find dy/dt when x=8 dx/dt=10
     
  2. jcsd
  3. Jul 21, 2011 #2
    What is the derivative of -3x with respect to t, in terms of dx/dt?


    First, solve for y, using the first equation. Then get dy/dt in terms of x and dx/dt using the chain rule.
     
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