1. Inverse and Identity Matrices Can only be used for square matrices. (2x2, 3x3, etc.)

2. Identity Matrix identity – number used to keep a value the same identity matrix – matrix used to keep a matrix the same A*I = I*A = A

3. Inverse Matrix inverse – number used to get the identity inverse matrix – matrix used to get the identity matrix A*A -1 = A -1 *A = I

4. Inverse Matrix

8. Solving Systems 3x – 5y = -26 -x + 2y = 10

9. Solving Systems 3x – 5y = -26 -x + 2y = 10

10. Solving Systems 3x – 5y = -26 -x + 2y = 10

11. Solving Systems 3x – 5y = -26 -x + 2y = 10

12. Solving Systems 3x – 5y = -26 -x + 2y = 10

13. Solving Systems 3x – 5y = -26 -x + 2y = 10 ( -2, 4 )

14. Practice Solve the system using the inverse matrix. x – y = 2 2x + 3y = 14