I need the equations and the answer

Question

Charlie does a weekly exercise program consisting of cardiovascular work and weight training. Each week, he exercises for at least 10 hours. He spends at most 12 hours doing cardiovascular work. He spends at most 4 hours on weight training. Let x denote the time (in hours) that Charlie 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 x and y that satisfy these requirements.

Answer 1

On xy axis draw the line x+y=10  (slope -1; y intercept 10)

Draw vertical line at x=12

Draw horizontal line y=4

Area will be all that above or on x+y=10, but on or below x=12 and y=4