Question

The graph below shows that the rate of haircuts given at a barbershop throughout the day is 11 haircuts every 4 hours.

Another barber is hired, and the number of haircuts given is increased by 1 every 4 hours. What is the slope of the line after the new barber is hired?

A
412

B
511

C
115

D
124

Answer 1

The slope of the new line would be 12/4.

Slope is the ratio of the rise of a line to its run; in this case, the number of haircuts to the amount of time. In the original line, it is 11/4. Once the new barber is added, it increases by 1 cut every 4 hours, so it becomes 12/4.