# Activities

• • • ##### Subject Area

• Math: Algebra I: Linear Functions

• ##### Author 9-12

60 Minutes

• ##### Device
• TI-73 Explorer™
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus Silver Edition

TI Connect™

• ##### Accessories

TI Connectivity Cable

• ##### Other Materials
This is Activity 9 from the EXPLORATIONS Book:
Topics In Algebra 1.

## Linear Functions: Slope-Intercept Form

#### Activity Overview

Students learn to develop the equation of a line from its graph. They also learn to write the equation of a line from the slope and the y-intercept, a point and the slope, and two points. They also investigate slopes of lines that are parallel and perpendicular.

#### Before the Activity

Install Topics in Algebra 1 (Chapters 1-4) App on the calculator using one of these two methods:

• TI Connect™, a TI Connectivity Cable, and the Unit-to-Unit Link Cable
• TI-Navigator™  "send to class" feature
• See the attached PDF file for detailed instructions for this activity
• Print pages 3-28 to 3-32 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Use algebraic manipulations to convert an equation into y = mx + c form
• In the activity Match It!, select the graph that correctly illustrates an equation
• In the activity Line Soccer, solve an equation by using the coordinates to find the values of m and b
• Graph a line using the given coordinates of a point and the slope
• Find coordinates of two other points from the graph of the line
• Use the calculator to graph lines for the two given equations and compare them
• Identify the characteristics of parallel lines
• Graph other equations and compare the lines formed
• #### After the Activity

Students will complete the Student Worksheet and analyze the results.

Review student results:

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