Final answer:
To graph the situation, plot the points on a coordinate plane and connect them to form a straight line. The unit rate of this relationship is 1 mile per 5 minutes.
Step-by-step explanation:
To graph the situation, we can use a coordinate plane. The x-axis represents time in minutes, and the y-axis represents the distance in miles. We plot the points (0,0), (20,4), (40,8), and so on, forming a straight line that passes through the origin.
To find the unit rate or slope of this proportional relationship, we can choose any two points on the line. Let's choose (0,0) and (20,4), which represent 0 minutes and 4 miles, respectively. The change in distance is 4 miles, and the change in time is 20 minutes. So the unit rate of this relationship is 4 miles per 20 minutes.
To simplify the unit rate as a fraction, we can divide both the numerator and denominator by their greatest common divisor, which is 4. Dividing 4 by 4 gives us 1, and dividing 20 by 4 gives us 5. Therefore, the unit rate is 1 mile per 5 minutes.
Both the unit rate and the slope of the graph equal 1 mile per 5 minutes.