# If #x^2+y^2=25# and #dy/dt=6#, how do you find #dx/dt# when #y=4# ?

##### 1 Answer

Sep 21, 2014

There are two values depending on the point.

Let us look at some details.

First, let us find the values of

By plugging in

Now, let us find some derivatives.

By differentiating with respect to

by dividing by

by subtracting

Since