Suppose you are at an event selling cake slices and cupcakes. Each cake slice cost $1.50 and each cupcake $.50. In the end you make a total of $78.50. You sold a total of 87 cake slices and cupcakes combined. How many cake slices and cupcakes were sold? Let, x= number of cake slices and y= number of cupcakes

1.50x+.50y=78.50

x+y=87