The distance a car drives, in miles, is proportional to the number of gallons of gas it uses. The graph shows this relationship.
A line graph, titled Distance Traveled by a Car, representing the relationship between gas in gallons and distance in miles. The following points are plotted (0, 0), (1, 21,) and (5, 105). A line is drawn through the points, starting at the origin. Select from the drop-down menu to correctly complete the statement. The unit rate is ___ .
