please Help in calculus?

Question

please if anyone explains how to do this i will appreciete

A jogger runs around a circular track of radius 75 ft. Let (x,y) be her coordinates, where the origin is the center of the track. When the jogger's coordinates are (45,60), her x-coordinate is changing at a rate of 13 ft/s. Find . dy/dt

Answer 1

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The circle is x^2+ y^2= 75^2

2x*dx/dt + 2y* dy/dt= 0

Now plug in x= 45, y= 60, dx/dt= 13

Hoping this helps!