Education Technology

# Activities

• ##### Subject Area

• Math: Algebra I: Matrices

9-12

60 Minutes

• ##### Device
• TI-89 / TI-89 Titanium
• TI-92 Plus / Voyage™ 200

## Matrices and Linear Equations

#### Activity Overview

This Computer Algebra System (CAS) activity encourages students to investigate addition, subtraction, and multiplication of matrices. They find the inverse of a matrix. Students also solve a set of linear equations by using matrices.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 1 - 7 from the attached PDF file for the class
• #### During the Activity

Distribute the pages to the class.

• Perform operations like addition, subtraction, and multiplication on matrices
• Examine the unit matrix
• Find the product of a scalar and a matrix
• Determine the inverse of a matrix
• Understand that finding the inverse replaces the idea of division
• Solve a system of linear equations using matrices
• #### After the Activity

Students' answer questions on the Activity sheet.

Review student results:

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