Cell Phone Problem

Sally is comparing Sprint to Verizon cell phone rates. Sprint charges $25.00 per month plus and .10 per minute for the use of the phone. Verizon charges $10.00 per month and .20 per minute for the use of the phone. How long would Sally have to use her phone to make Sprint the better choice.

Step 1: Calculate information for Verizon

Create a t-table

Create a graph

Create the rule

Give the slope and explain in a complete sentence

Give the y-intercept and explain in a complete sentence

Step 2: Calculate information for Sprint

Create a t-table

Create a graph - you may graph this on the same graph as Verizon. Use a different color for Sprint. 

Create the rule

Give the slope and explain in a complete sentence

Give the y-intercept and explain in a complete sentence

Step 3: How long? 

Use the graph to determine how long Sally would have to use her phone to make Sprint the better choice.

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