Question

Help!! matrix encoding.. I think I got it but I am not sure

Answer 1

I Got..
15-14-5-0-17-21-5-19-20-9-15-14-0-20-15-0-7-15

Answer 2

That is not ended yet how do I encode the message?

Answer 3

I took this class last year. I aced the whole unit on matrices! I love them!

Answer 4

A - 1
B - 2
C - 3
D - 4
and so on, with "blank space" - 0.

Using this key, your message, ONE QUESTION TO GO, becomes
15−14−5−0−17−21−5−19−20−9−15−14−0−20−15−0−7−15

(A total of 18 characters)
Write the message as a sequence of 2x1 matrices:
[15],[5],[17],[5], [20],[15], [0], [15], [7]
[14] [0] [21] [19] [9] [14] [20] [0] [15]

This last step was necessary because when you encode, you find the matrix product of the encoding matrix and the 2x9 matrix made up of the matrices I've set up above:
[1 −2] [15 5 17 5 20 15 0 15 7]
[3 7] [14 0 21 19 9 14 20 0 15]

The resulting matrix is the encoded message, read top to bottom, left to right.
Note: that the inverse of the encoding matrix multiplied by the product of the encoding and message matrix gives you the initial message matrix.
-13 | 5 | -25 | -33 | 2 | -13 | -40 | 15 | -23
143 | 15 | 198 | 148 | 123 | 143 | 140 | 45 | 126

Answer 5

Oh my gosh you are amazing!!! THANK YOU!!!