1. Systems of Equations Lesson 41: Solve by using a matrix
Texas Algebra I
Systems of Equations
Lesson 41: Solve by using a matrix

2. Lesson Objectives The student will be able to: (A.8.b)
Solve a system of equations by using a matrix

3. Why use a matrix to solve a system?
You can use your graphing calculator to help you solve a system. The best way to let your calculator help you is by using a matrix.
EX:
2x - 3y = 4
5x + 6y = 6

4. Using a graphing calculator
EX: 2x - 3y = 4 5x + 6y = 6
Now that you have your equations entered into matrices, call the left side matrix A and the right side B (the calculator will solve for the variables.
Enter your matrices into you calculator
Enter
The calculator will display the solution matrix

5. Another example (this method is really useful for systems with 3 or more equations!!)
2x + 3y = 12 10x +5y = 6 x – y = 2

6. Lesson Objectives The student will be able to:
Solve a system of equations by using a matrix