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How to solve the following decoding matrix while using a TI-83

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How to solve the following decoding matrix while using a TI-83. What is the step by step process?
I have tried multiplying but keep getting error. while solving all the following problems. 

1- Using the coding matrix A=  [812?−610?] to encode the word "even".

[_____    ______]

[_____    ______]

Find the inverse of A to be able to decode " -24, 116, -24, 268 "
The decoding message saids____


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2 - Using the coding matrix A=  [510?−6−11?] to encode the word "camp".

[_____    ______]

[_____    ______]
Find the inverse of A to be able to decode " -4 ,1 ,80 , 165 "
The decoding message saids____