*see attachment for the graph
Answer:
Unit rate = 50
It means 50 miles per hour
Explanation:
On the graph given, two points are noted in the line. They are (2, 100) and (5, 250).
The graph is a proportional graph because the line passes through the point of origin, (0, 0). Thus, unit rate of variable x and y of this kind of graph = y/x.
Using one of the points, (2, 100):
Unit rate = y/x = 100/2 = 50.
This means Darius traveled 50 miles per hour.