Michael's father is giving him an interest-free loan for a $20,000 car. michael plans to give his father a $5000 down payment and pay $500 per month. the total amount paid can be represented by the linear function t = 500m + 5000 where t is the total paid to his father and m is the number of months. if michael gives his father a $10,000 down payment instead, what part of the linear function should michael change?