What is the overall savings for the no-phone contract after 24 months?What was the equation for the total cost of the with-phone contract?

Consider the example above.
1) What was the equation for the total cost of the with-phone contract?

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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?
$
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3) The graph of both contracts shows the with-phone contract to be how much cheaper at the start, when months is 0?
$
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4) The breakeven point, where the no-phone contract’s total cost becomes cheaper, is at how many months?
months
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5) The graphs not only show the breakeven point, 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?