Education Technology

# Activities

• ##### Subject Area

• Math: Geometry: Points, Lines and Angles

6-8

60 Minutes

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

TI Connect™

• ##### Accessories

TI Connectivity Cable

• ##### Other Materials
The following equipment is required for this activity:
• TI-Presenter™

• LCD Projector
• Two screens

## Coordinate Geometry The Equation of a Line

#### Activity Overview

This activity teaches students the relationship between the slope, y-intercept, and the equation of a line.

#### Before the Activity

Install the Cabri™: Jr. App on the students' graphing calculators 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 1 - 13 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Plot a point in the first quadrant and display its coordinates
• Plot a point on the Y-axis and display its coordinates
• Draw a line connecting these two points and display its equation
• Display the slope of the line
• Drag the point in the first quadrant and observe the change in the equation of the line
• Drag the y-intercept along the y-axis and observe the effect on the equation of the line
• Make conjectures about the slope and y-intercept
• #### After the Activity

Review student results:

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