Answer:
The horizontal line has a rate of change of 0, since it has a slope of 0
Explanation:
On the other hand, the vertical line has an undefined slope.
Slope is rise/run or change n y over change in x.
If the y axis coordinate never changes, then rise = 0. The only number that changes is x. x changes 1 for every 0 y changes. 0/1 = 0.
In a vertical line, however, the x coordinate is the one that doesn't change. We reverse the number from before, but we have a problem 1/0 is an undefined number since you cannot divide by 0.
Answer is second graph shown