Consider the two functions described below.

function 1 is represented by the graph below. it shows the distance carl travels y in x hours at a constant speed.

function 2 represents the following scenario: the equation y = 25x gives the distance y sheila travels in x hours.

which is a correct description of how to compare the rates of change in each scenario?
a. compare the change in x over the change in y for each function.
b. compare the change in y over the change in x for each function.
c. compare the values at which the graphs cross the x-axis.
d. compare the values at which the graphs cross the y-axis.