PARTICIPATION ACTIVITY
2.4.2: Comparing cell phone plans.
1) What was the equation for the total cost of the with-phone contract?
2) Shay chose to plot points for x = 10 and x = 20 because those values were round numbers and so a bit easier to calculate and draw. For the no-phone contract, what did Shay determine as the y value when x was 10?
3) The graph of both contracts shows the with-phone contract to be how much cheaper at the start, when months is 0?
4)The breakeven point, where the no-phone contract’s total cost becomes cheaper, is at how many months?
5)The graphs not only show the breakeven point (15 months), but give a person a quick way to see the cost difference for any number of months. At 24 months, a person might visually see the blue line at about 1200 and the purple line at about 1000. What is the overall savings for the no-phone contract after 24 months?