Catalina and Terri are each saving money to buy a car. Catalina puts $1000 in a safe at home and adds $25 every month. Terri puts $500 in a savings in a savings account at the bank that earns 3.2% interest each month on the total amount of money in the account. For each person, the total amount saved is a function of the number of months. Which of these relationships is a linear function?