Linear Relationships - Comparing Costs

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a) Determine the cost of each plan if you send 500 text messages in one month. Show your working out.

Plan A: $79.95
Plan B: $90.2
Plan C: $74.95
I worked this out by looking at the graph where the x axis was 500 (the x axis was amount of texts sent), and then I saw where each line landed on the y axis.

b) Your boss asks you to visually display three plans and compare them so you can point out the advantages of each plan to your customer.


c) A customer wants to know how to decide which plan will save her the most money. Determine which plan has the lowest cost given the number of text messages a customer is likely to send.

For anything less than 400 texts, Plan A is the best (cheapest).
For anything more than 400 and less than 800 texts, Plan C is the best (cheapest).
For anything more than 800 texts, Plan B is the best (cheapest).

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