1. The problem statement, all variables and given/known data I search all over my textbook and did not show any (simple) examples on relation rates(seriously). Well, The first problem is, x^2+y^2=25 find dy/dt when x=3. dx/dt =4 and it says find the indicated rate and assume x>0 and y>0 2. Relevant equations I did my best considering the circumstances, I derived and got 2x(dx/dt)+2y(dy/dt)=0, applied 3 and got 6+2y=0 then 2y=-6 . 3. The attempt at a solution Then divided and got -6/2y=-3y The answer stated -3 so I guess I am close. With these, what is the difference between implicit diff. and relation rates? and what is the difference in steps?