my instructor lately likes to give us a question and have us figure it out unfortunately dont know how to program calculator (ti-83 plus) and i have no notes on how o answer this question:

using the encoding matrix [2 3 5]

[7 11 13]

[17 19 23], i have encrypted the following me-

ssage: [115 234 128 152 200]

[398 708 421 444 583]

[724 1326 737 876 1115]

- figure out the decryption matrix
- Decrypt the message
- what was the message i encrypted?

my problem is this sholud i plug this in on the calculate or right it out? and even so how would i right it out on the calculator?

directing me to other sites, so i can do research would greatly help me out. thank you