Jacob is working two summer jobs, making $12 per hour washing cars and making $8 per hour landscaping. In a given week, he can work no more than 13 total hours and must earn a minimum of $120. Also, he must work no more than 10 hours washing cars and at least 3 hours landscaping. If a represents the number of hours washing cars and y represents the number of hours landscaping, write and solve a system of inequalities graphically and determine one possible solution.