Education Technology

# Activities

• ##### Subject Area

• Math: Algebra I: Linear Functions

6-8

100 Minutes

• ##### Device
• TI-83
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus Silver Edition

• ##### Other Materials
This is Activity 11 from the EXPLORATIONS Book:
Graphing Calculator Activities for Enriching Middle School Mathematics

## What's My Line?

#### Activity Overview

This activity focuses on strengthening student understanding of connections among graphical, tabular, and algebraic representations of simple linear functions. They enter a simple program that allows them to determine the equations for lines, in the form Y = AX + B, based on tabular and graphical information.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 107 - 112 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Run the LINE program
• Examine the table of values of the expression AX + B for different integer values of X
• Study a graph of the ordered pairs satisfying the equation Y = AX + B
• Guess the values of A and B and check whether they are correct

• Run the program and select 2 random integer values for A and B
• View the entry placed by the program in the graph menu or view a table of values of ordered pairs
• Observe the graph of Y = AX + B and make a guess for the values of A and B
• Compare the results of the two guesses
• #### After the Activity

Students complete the Questions sheet.

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary