Mr. Wilson asked his class to sketch a graph that would represent the following activity: start 3 meters away from me and walk quickly away from me for 3 seconds. Stand still for 6 seconds and then walk quickly toward me for 3 seconds.

The first starting point is 3 meters away from Mr. WIlson therefore the y-intercept of the graph has to be at y=3. Then, the distance increases and remains unchanged for 6 seconds and finally decreases for another 3 seconds.
Therefore, the graph of the function is: