2.1.1 Calling Plans

Unit 2: Linear Relationships

SWBAT:Compare calling plans by using graphs, tables, and equations

Calling plan options: Long-distance Company A has a monthly fee of $5, plus 4 cents per

minute

Long-distance Company B offers 5 minutes per dollar with no monthly fee

  Long-distance Company C has a flat monthly fee of $8

Long-distance Company D

Minutes Used 5 10 50 100Total Cost ($) $3.30 $3.60 $6.00 $9.00

1. a. What is Plan E’s cost per minute? Describe the method you used.

b. Use another method to determine the cost per minute.

2. Use a color and add the graph of Plan A to the graph of Plan E on LabSheet CP1 (see next slide). Be sure to label the graph lines of the plans and create a key.

Unit 4 – Calling Plans LABSHEET CP1

3. Using the methods you developed in Question 1, prove that the graph for Plan A represents a charge of 4 cents per minute.

4. Compare the graph of Plan A with the graph of Plan E. Which plan has a greater cost per minute? Explain how you can tell this just by looking at the graph.

Homework:Day 2 task sheet (5 – 8)