Just need confirmation on a problem.

[johnnyvf24]

Hello, I am working on a math project for my Linear Algebra class. However I have run into other materials that I am really uncertain on and have not yet run across before in math. All I really want is confirmation that this is right. Thanks P.S. This is not material we are covering in class, but it is essential to the application I'm describing in my paper.
I know this is vague so I will mention that this involves hill ciphers and they start implementing Euclidean algorithms to change matrices into Modulo 26 (for our 26 letters in the english language). I am not sure I have done all this right, but if that last part is right then I would have more confidence in the rest of my paper.

 

[HallsofIvy]

So you are asking if each of the numbers in the first array is equivalent, modulo 26, to the corresponding number in the second array? Yes, although I would have written the last number in the bottom row of the second array as "0", not "26".