Education Technology

# Activities

• ##### Subject Area

• Math: Algebra I: Equations and Inequalities

9-12

60 Minutes

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

TI Connect™

• ##### Accessories

TI Connectivity Cable

• ##### Other Materials
This is Activity 2 from the EXPLORATIONS Book:
Exploring Mathematics with the Inequality Graphing Application

The following materials are required for this activity:
• Tracing paper

## Tracing Paper Inequalities

#### Activity Overview

Students graph systems of linear inequalities in two variables in the Cartesian coordinate plane and find their solutions.

#### Before the Activity

Install the Inequality Graphing Application 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 17-22 from the attached PDF file for your class

#### During the Activity

Distribute the pages to your class.

• Write down two linear inequalities with 2 variables and graph them on sketch papers
• Place the two graphs one on top of the other and align the axes
• Observe the common shaded region
• Verify these graphs by using the Inequality Graphing Application
• Verify algebraically whether a point is a part of the solution set
• Observe that a system of linear inequalities has a common region as a solution set, whereas a system of linear equations has only one solution, the point of intersection
• #### After the Activity

Students will complete the Student Worksheet and answer questions listed in it.

Review student results:

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