[TI-M] Math problem help


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[TI-M] Math problem help




I just got a question from school and was woundering if any of you are able
to help me out with this a little.

Heres the question:
If a pt is moving on a circle with a center of (2,-3), and the rate of
change of the x is .25 inches/sec. then find the rate the y changes when x=1
and y=-1.  Radius is Rad 5.

Can someone please state the formula i need to use and the derivative of
that formula so I can plug in the rest of the values.  Thx.  I believe the
formula to use is (x-h)^2+(y-k)^2=r^2, but I'm not sure.  Any help
appreciated.  Thx