Catelyn has 2 summer jobs. Each week, she works at least 15 hours at a pet store and at least 6 hours as a nanny. She earns $10/hour at the pet store and $8/hour as a nanny. Catelyn wants to work no more than 30 hours and earn at least $250/week. Let x represent the number of hours Catelyn works at the pet shop in one week and y represent the number of hours she works as nanny in one week. Write an inequalities that model the four constraints in this situation.