# Activities

• • • ##### Subject Area

• Math: Algebra I: Linear Functions

• ##### Author 9-12

60 Minutes

• ##### Device
• TI-30X IIB
• TI-30X IIS
• TI-34 II Explorer Plus™
• ##### Other Materials
This is Activity 4 from the EXPLORATIONS Book:
Math Investigations with the TI-30X IIS: Activities for Secondary Mathematics

The following material is required for this activity:
• Coordinate graph paper

Walking the Line

#### Activity Overview

Students use linear functions to model and solve problems in situations with slope and a constant rate of change. They learn to represent situations with variables in expressions, equations, and inequalities and use tables and graphs as tools to interpret them.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 38 - 42 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Given the coordinates of two points, use the slope formula to find the slope of the line passing through the two points
• Change the decimal result to a fraction

• For each given ordered pair of numbers, plot the points, draw a line through the points, and find the slope of the line
• Solve a real world problem and understand the meaning of the slope in the given situation

• Make a plot of the data pairs from the given problem, draw a line through the pairs, and use the linear model to predict results

• Write an equation to model given data, use the equation to generate several data pairs, plot the points, and find answers
• #### After the Activity

Students complete the Student Activity pages.

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