Create a graph showing the equations and . Explain how the graphs are the same and how they are different.

An internet company charges $70 per month for internet service to existing customers.

1. Write an equation representing the relationship between , the number of months of service, and , the total amount paid in dollars by an existing customer.
2. For new customers, there is a one-time $100 installation fee. Write an equation representing the relationship between , the number of months of service, and , the total amount paid in dollars by a new customer.
3. Explain how graphs of the lines representing each situation would be the same and how they would be different.

A mountain road is 5 miles long and gains elevation at a constant rate. At the start of the road, the elevation is 4,800 feet above sea level. After 2 miles, the elevation is 5,500 feet above sea level.

1. Find the elevation of the road after 5 miles.
2. What is the vertical intercept and what does it represent in this situation?

Match each graph to a situation.