Need help with a few important homework questions

**Graph y^2=2xy**

The thing with this is that I just don't know how to solve for Y. Apparently I'm not supposed to divide Y from both sides?

Also I have no idea how to do this next one.

**A machine is rolling a metal cylinder under pressure. The radius of the cylinder is decreasing at a constant rate of 0.05 inches per second and the volume is a constant 128(pi) cubic inches. At what rate is the length ***h* changing when the radius *r* is 1.8 inches?

And I'll just throw in this third one cuz I'm not sure if I did it right.

**What Values of ***c* are guaranteed by the Mean Value Theorem for f(x)=(x-2)^3 on the interval [-1,2]?

I got 2-(the square root of)3.

Thanks