How fast is the point approaching the origin?

Question

A point moves along a hyperbola, 4x^2-y^2 = 64 at the rate of 9 per second. If the point is in the first quadrant, and moving towards the x-axis, find Vx & Vy when y = 8. How fast is the point approaching the origin?

Answer 1

You might want ask that question under the math category.  I've taken math up to integral calculus and I don't even know how to solve that.