18. [-/2 Points] DETAILS LARCALC11 2.6.005. Assume that x and y are both differentiable functions of t and find the required values of dy/dt and dx/dt. xy = 8 (a) Find dy/dt, given x = 6 and dx/dt = 13. dy/dt = (b) Find dx/dt, given x = 1 and dy/dt = -8. dx/dt = Need Help? Read It