Education Technology

# Activities

• ##### Subject Area

• Math: Algebra I: Linear Functions

9-12

45 Minutes

• ##### Device
• TI-Nspire™ CX/CX II
• TI-Nspire™ CX CAS/CX II CAS
• TI-Nspire™
• TI-Nspire™ CAS
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

3.2

## Horizontal and Vertical Lines

#### Activity Overview

Examine the vertical and horizontal changes when moving from one point to another on a line.

#### Objectives

• Students will identify lines with zero and undefined slope.
• Students will describe, in terms of coordinates, what is special about points on horizontal and vertical lines.
• Students will explain why the slope of a horizontal line is zero and why the slope of a vertical line is undefined.

• Slope

#### About the Lesson

The activity involves examining the vertical and horizontal changes when moving from one point to another on a line. As a result, students will:

• Understand that when the vertical change between two points is zero, the slope is zero, and when the horizontal change between two points is zero, the slope is undefined.
• Move points and will observe the line move as well as the vertical and horizontal change.