ANSWER :
a. 0.25 miles per gallon
b. 4
EXPLANATION :
From the graph, we can select the point (50, 200) in which 50 miles can be traveled by consuming 200 gallons.
a. Solve for the miles per gallon :
[tex]\frac{50\text{ }miles}{200\text{ }gallon}=0.25\text{ }miles\text{ }per\text{ }gallon[/tex]
b. The slope of the graph is the difference of y over the difference of x
Using the same point with the origin (0, 0)
That will be :
[tex]slope=\frac{200-0}{50-0}=4[/tex]
