Assume that x and y are both differentiable functions of t and find the required values of dy/dt and dx/dt.x + y = 169(a) Find

Assume that x and y are both differentiable functions of t and find the required values of dy/dt and dx/dt.x² + y² = 169(a) Find dy/dt, given x = 5, y = 12, and dx/dt = 5.dy/dt =(b) Find dx/dt, given x = 12, y = 5, and dy/dt = -4.dx/dt =