2. Was your plan in part B an example of direct variation (the plan depended only on the time spent talking) or a partial variation? (the plan depended on the time spent talking and an initial cost). 3. Which Plan best for you? Was this the same as your hypothesis? 4. Which plan had the highest rate of change? Which plan has the lowest slope? 5. Using your graph, which plan would be best if you talked for 200 minutes? 6. When is the Rogers My5 plan better than the Telus prepaid plan? 7. Which plans are an example of direct variation? 8. Come up with at least 3 other things that need to be considered when choosing your cell phone plan (aside from cost per minute talking), and explain why these are important to you.

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  2. not direct variation; is "partial variation"

  3. Public Mobile

  4. highest: Telus (prepaid); lowest: Public Mobile

  5. Public Mobile

  6. > 200 minutes

  7. Plans 1, 2, 3 (with b=0) are direct variation

Step-by-step explanation:

Reference link for more information

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2. The "Part B" plan chosen has a y-intercept (b) of 24, so is not direct variation. Here, that qualifies it as "partial variation."

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3. The lowest rate by far for 600 minutes is offered by Public Mobile (plan 6). That is the same as our hypothesis.

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4. The highest rate of change (m) is that for Plan 3, Telus (prepaid). Its cost of $0.35 per minute is higher than that for any other plan.

The plan with the lowest slope (m) is Plan 6, Public Mobile, which has zero slope.

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5. A graph of all the plans is shown in the attachment. For any time over 140 minutes, Plan 6, Public Mobile, is the lowest cost.

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6. On the graph, the purple line (Rodgers MY5) plan becomes lower cost for more than 200 minutes. Below that time, the green line (Telus prepaid) is lower cost.

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7. Plans 1, 2, 3 have no cost for zero minutes, so they are all examples of direct variation.

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8. This is a personal question, so cannot be answered for you. Some of the things usually considered (in no particular order) are ...

  on-line user ratings

  coverage map

  roaming charges

  availability of automatic payments

  personal experience with the carrier

  choice (and cost and features) of compatible phones

  data and/or text options (speed, cost, amount available)