Rafael does a weekly exercise program consisting of cardiovascular work and weight training. Each week, he exercises for at least 5 hours. He spends at most 3 hours doing cardiovascular work. He spends at most 12 hours on weight training. Let r denote the time (in hours) that Rafael spends doing
cardiovascular work. Let y denote the time (in hours) that he spends on weight training. Shade the region corresponding to all values of r and y that
satisfy these requirements.