• • ##### Device
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus CE
• ##### Software

TI Connect™
TI Connect™ CE

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Algebra I: Dog Days or Dog Years?
by Texas Instruments - Bell Ringer Lesson #### Overview

Students will use order pairs, table of values, and a scatter plot to determine a function that represents real world data.

#### Key Steps

• Students will investigate data that takes a dog’s age and converts it into human years. They will analyze the data to determine if the claim that each dog year is equal to 7 human years is supported. Students will first use a dynamic input/output program to determine some ordered pairs of the data.

• Then students will gather information from lists and a scatter plot. They can use the Trace feature to move through the points. Students should see that two linear functions can represent the data.

• After using points to calculate slope and write the equation of a line, students will graph their functions on the scatter plot. They can then use the graph to determine a dog’s age in human years beyond 8 years old.