A custodian went to buy x boxes of cleaning supplies and y boxes of light bulbs. He had the back of a van to transport them. Given a maximum amount that he could spend, and a limited space to put the supplies in, the following system of inequalities and graph represent the constraints. LOOK AT SCREENSHOT FOR THE GRAPH

Which of the following points represent real solutions for this situation? Select all that apply.

(0, 40)
(30, 20)
(37.5, 15)
(50, 5)