231. At noon, my odometer read 6852 miles. At 3:30 pm, it read 7034 miles.
(a) What was my average rate of change during these three and a half hours?
(b) Let t represent the number of hours I have been driving since noon and y represent my
odometer reading. Write an equation that relates y and t. Assume constant speed.
(c) Graph your equation.
(d) Show that the point (5,7112) is on your line, and then interpret this point in the context
of this problem.