The tenth graders at a high school are raising money selling individual slices of pizza and pizza pies. The profit for the number of slices of pizza sold was $1.25, and the profit on each pizza pie sold was $4.75. The profit for the fundraiser was $1,542.50 for 450 orders of pizza pies and individual pizza slices. Part A: If x represents the number of pizza slices sold and y represents the number of pizza pies sold, construct a system of equations to model this situation