Brody is working two summer jobs, making $20 per hour lifeguarding and making $10 per hour washing cars. In a given week, he can work at most 10 total hours and must earn a minimum of $120. If x represents the number of hours lifeguarding and y represents the number of hours washing cars, write and solve a system of inequalities graphically and determine one possible solution.

Brody could work - hours lifeguarding and - hours washing cars.