Andi wants to spend no more than $50 on Halloween treats. She wants to buy candy bars that cost $1 each and lollipops that cost $0.50 each, and she wants the number of lollipops to be at least three times the number of candy bars.
Write a system of inequalities to model this situation. Graph the system. Can she buy 20 candy bars and 70 lollipops? Can she buy 15 candy bars and 65 lollipops?
