1. Lesson 3

1.4. Explore 4

Mathematics 20-2 Module 6

Module 6: Proportional Reasoning

 

Functions can also be written to help solve problems involving rates. Linear functions represent situations where a rate of change is constant.

 

This is a photo of a house in a box.

Comstock/Thinkstock

This is a photo of a woman using a cellphone.

Stockbyte/Thinkstock

Consider the following situation.

 

Rajesh’s sister, Akuti, is preparing for the move by finding a new cellphone plan. She intends to keep in contact with her friends through texting. She has two choices for an add-on texting plan: a pay-per-use plan and a texting bundle. Both plans only charge for outgoing text messages. Incoming texts are free. You can view Akuti’s Options to see the two plans.

 

 

This is a screenshot for Akuti’s Options.