Education Technology

Do You See What I See?

Activity Overview

Students discover how pictures formed by graphing ordered pairs can be stretched and shrunk by multiplying and dividing the coordinates.

Before the Activity

  • Set up the calculator as explained in the activity
  • See the attached PDF file for detailed instructions for this activity
  • Print pages 21 - 24 from the attached PDF file for your class
  • During the Activity

    Distribute the pages to the class.

    Follow the Activity procedures:

  • Examine the transparency of the tree graph
  • List the x- and y- coordinates for the points on the graph
  • Enter the ordered pairs as lists in the calculator
  • Graph the points for the ordered pairs and observe the shape of the tree
  • Change the y-values and predict the change in the shape of the tree
  • Use the new list of ordered pairs, plot the points, and verify the prediction
  • Understand that the tree can be made tall by increasing the y-values
  • Repeat the activity by changing the x-values
  • Observe that the tree can be made wide by increasing the x-values
  • After the Activity

    Students complete the Student Activity sheet.

    Review student results:

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