Brandon is working two summer jobs, making $18 per hour lifeguarding and making $10 per hour washing cars. In a given week, he can work a maximum of 15 total hours and must earn a minimum of $190. Also, he must work at least 8 hours lifeguarding. If xx represents the number of hours lifeguarding and yy represents the number of hours washing cars, write and solve a system of inequalities graphically and determine one possible solution.