How to Find the Inverse Matrices on a TI-83

The Texas Instruments TI-83 is a scientific graphing calculator that can calculate matrices using the menu system. The TI-83 has a dedicated matrix button that allows you to enter matrices of different sizes, up to 3 by 3. To calculate the inverse matrix, first enter the values for the matrix into the calculator's memory. Once the values have been entered, calculate the inverse matrix using a key combination.

Instructions

1. Press the "Matrix" button to enter the matrix menu.

2. Press "1" to select the fist entry.

3. Type the number of colums, then press "Enter."

4. Type the number of rows and press "Enter" again.

5. Type in the values for the first element, then press "Enter" to move to the next element. Keep going until all the fields are filled.

6. Press the "2nd" key, then press "Quit" to exit.

7. Press the "Matrix" key, then press "1" and "x^-1" and "Enter" to calculate the inverse matrix.

Tips & Warnings

• If the first field in the matrix menu has a matrix already saved, press the right arrow button twice then press "Enter" to select "Edit."

References

• Texas Instruments: Calculating the Inverse of a Matrix on theTI-83 Family, TI-84 Plus Family, or TI-Nspire Handheld in TI-84 Plus Mode
• North Carolina State University; "Quick-and-Dirty Guide to the TI-83, TI-83+, TI-84, and TI-84+"; Kenny Felder; 2004
• Pellissippi State Community College: Matrix Arithmetic on the TI-83

Resources

• Texas Instruments: TI-83 Guidebook