1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook