Angel is working two summer jobs, making $7 per hour washing cars and making $14
per hour clearing tables. In a given week, he can work no more than 14 total hours
and must earn a minimum of $140. Also, he must work at least 3 hours washing cars.
If a represents the number of hours washing cars and y represents the number of
hours clearing tables, write and solve a system of inequalities graphically and
determine one possible solution.