Encode and Decode Messages
-Use the Coding Matrix $A = \left[ \begin{array} { r r r } 1 & - 2 \\ 1 & 2 & 3 \\ 1 & 1 & 1 \end{array} \right]$

Encode and Decode Messages
-Use the coding matrix $A = \left[ \begin{array} { r r r } 1 & - 2 \\ 1 & 2 & 3 \\ 1 & 1 & 1 \end{array} \right]$ to encode the message COME_HERE.

A) $\left[ \begin{array} { r r r } - 23 & - 11 & - 5 \\ 72 & 29 & 56 \\ 31 & 13 & 28 \end{array} \right]$
B)

C) $\left[ \begin{array} { r r r } 19 & 27 & - 21 \\ - 14 & - 30 & 39 \\ 8 & 11 & - 13 \end{array} \right]$
D) $\left[ \begin{array} { r r r } - 7 & - 21 & 3 \\ 28 & 69 & 44 \\ 13 & 33 & 26 \end{array} \right]$