Question

The number of miles driven is proportional to the gallons of gasoline used. The graph shows this relationship. What is the unit rate for miles driven per gallon? The graph shows distance traveled, in miles, on the y-axis and gasoline used, in gallons, on the x-axis. The line goes through point (four, thirty-eight).

Answer 1

I think the answer is 9.5 because that is the only number that can be multiplied by 4 that gives you 38. 
(4,38) = y=9.5x