Ryan has two jobs. He earns $9 per hour for x hours babysitting his cousins and he earns $18 per hour for y hours working at the coffee shop. Ryan will work both jobs. He is able to work no more than 10 hours a week, due to school commitments . Ryan wants to earn at least $72 a week , working a combination of both jobs. Write a system of inequalities that can be used to represent the situation .