A delivery truck is purchased new for $54,000.
a. Compose a linear function of the form y = mt + b to represent the value y of the vehicle t years after purchase. Assume that the vehicle is depreciated by $ 6750 per year.
b. Suppose that the vehicle is depreciated so that it holds 70% of its value form the previous year. Write down an exponential function of the form y = V0bt , where V0 is the initial value and t is the number of years after purchase.