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more TI-89 Titanium help

i can do a random matrix thats fine, but unfortunately questions dont say hey make a random matrix and work this out

i can use the data/martix editor but then when i use mat>list( it jus puts all the numbers in a big long line like a list. and Mat>Data just doesnt do anything!

so if i wanna put in my own matrix from a question say, how the hell do i do it?

how would i put in a 3x3 matrix. and then work on it?


1,2,3
4,5,6
7,8,9
 
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