Sam is measuring the velocity of a car at different times. after two hours, the velocity of the car was 50km/h. after six hours, the velocity of the car is 54km/h.

part a: write an equation in two variables in standard form that can be used to describe the velocity of the car at different times. show your work and define the variables used. (5points)

part b: how can you graph the obtained in part a for the first seven hours? (5points)