You earn $10 per hour working as a manager at a grocery store. you are required to work at the grocery store at least 8 hours per week. you also teach music lessons for $15 per hour. you need to earn at least $120 per week, but you do not want to wok more than 20 hours per week. write a system of linear inequalities that represents the situation. use x for hours worked at the grocery store and y for hours teaching music lessons.