2.4. A school supply store sold backpacks of two sizes last week: small for $32 each and large for $48 each. The store sold a total of 80 backpacks for a total of $2,880. The system of equations below can be used to findx , the number of small backpacks sold, andy, the number of large backpacks sold. 32x + 48y = 2, \qquad x + y = 80 2,880 Which equation can be used to find the number of large backpacks sold?