Final answer:
The distance-time graph of Jackie's drive at constant speed would be a diagonal line, with the slope representing the speed of the vehicle.
Step-by-step explanation:
If Jackie drives from Grand Rapids to Ann Arbor at a constant speed, the distance-time graph would represent a diagonal line.
This is because the distance covered would increase uniformly with time, indicating a steady speed. The graph would slope upwards, where the slope would represent the speed of the vehicle—a steeper slope indicating a higher speed and a less steep slope indicating a lower speed.