Raj is deciding between two cell phone plans, A and B, which are both linear functions. The monthly charge for plan A according to the number of minutes used is shown in the table.

Monthly Charge for Plan A

Minutes used, x

Monthly charge ($), y











Plan B has the same monthly base charge as plan A, but it charges a different amount per minute used. If the total monthly charge for plan B is $22.10 when 45 minutes are used, what is the slope of the linear function that represents the cost of plan B?

  1. 👍 4
  2. 👎 0
  3. 👁 2,412
  1. the monthly charge for A is clearly 14.45 (0 minutes)

    So, for B, $(22.10-14.45)/45min = $0.17/min

    1. 👍 4
    2. 👎 0
  2. So B s correct answer?

    1. 👍 4
    2. 👎 2

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