A roofer charges $60 for the first hour of a service call and $20 per hour for each additional hour, as shown on the graph below.

Look at the above Roofer’s Prices graph and then answer the following questions.
Part A What is the slope of a line joining the points on this graph? Show your work or explain your answer.
Part B What does the slope represent?

A roofer charges 60 for the first hour of a service call and 20 per hour for each additional hour as shown on the graph below Look at the above Roofers Prices g class=