# Activities

• • • ##### Subject Area

• Math: Algebra I: Piecewise Functions

• ##### Author 9-12

60 Minutes

• ##### Software

TI InterActive!™

• ##### Other Materials
This is Activity 4 from the EXPLORATIONS Book:
TI InterActive! Math for High School

## Solving System of Equations: The Method of Substitution

#### Activity Overview

In this activity, students learn to solve a system of equations using the substitution method.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 31 - 34 from the attached PDF file for your class
• Solve for x and y in a system of equations using the substitution method and verify graphically
• #### During the Activity

Distribute the pages to the class.

• Define the equations of the system as eq1, eq2, and eq3
• Solve eq1 for z and solve eq2 for y
• Record both the equations
• Solve eq3 for x and record the value of x
• Redefine values of y and z and record the results
• Enter the values of x, y, and z in each of the equations and verify the results
• Observe that the values of x, y, z satisfy each equation, since the left side of each equation has the same value as the corresponding right side
• Solve other system of equations using the substitution method
• #### 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