# 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 7 from the EXPLORATIONS Book:
Topics In Algebra 1.

## Linear Functions: Slope Using Coordinates

#### Activity Overview

Students learn that the slope is ratio of change in y to the change in x. They find the slope of a line using the slope formula, and examine the characteristics of lines with positive, zero, negative, or non-defined slope.

#### 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 3-10 to 3-13 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Determine if any set of three coordinates is collinear
• Determine the correct method of calculating the slope of a line using the coordinates of two endpoints
• Calculate the slope between two points using the slope formula
• Link two calculators and use a grid to determine the slope of the line segments as quickly as possible
• Use the calculator to find the slope of a line using the coordinates of two points