Julia has $0.15 worth of pennies and nickels. She has 3 more pennies than nickels. By following the steps below, determine the number of pennies, x, commax, and the number of nickels, y, commay, that Julia has.
Determine three ways to have 3 more pennies than nickels:
1. x = y + 3
2. x - y = 3
3. x - 3 = y