i am using a ti-84 (ti 83s work the same way and most calculators should be fairly similar) first hit the matrix button for me that is second, x^-1 then move over to edit where you can choose matrices to edit you will first need to enter how large your matrix is and then it has you enter your numbers, you can move from number to number by enter or the arrow keys. After you have your matrices ready you can do calculations with them my going to matrix again and under names choosing the matrix you wish to use
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