The monthly cost, in y dollars, to download x movies is a linear function. The cost of Nate's service in described by y= 4x + 6. The table shows the cost of Elizabeth's service.

Movies, x 2 4 6 8

Cost (4), y 10 20 30 40

1. Write an equation to represent the monthly cost of Elizabeth's service.


2. Which movie service is cheaper for 8 movies in one month? Explain how you know.


3. Which movie service has the cheaper cost per movie? Explain how you know.


4. Which movie service has a one time fee and what is the fee? Explain how you know