Encode and Decode Messages
-Use the coding matrix $A = \left[ \begin{array} { r r } 1 & - 4 \ - 2 & 9 \end{array} \right]$ and its inverse $A ^ { - 1 } = \left[ \begin{array} { l l } 9 & 4 \ 2 & 1 \end{array} \right]$ to decode the cryptogram $\left[ \begin{array} { r r } - 7 & - 8 \ 16 & 21 \end{array} \right]$.
A) ABLE
B) ACTS
C) ARMS
D) ALAS

Question

Quizplus · Accepted Answer

The Answer of Encode and Decode Messages
-Use the coding matrix $A = \left[ \begin{array} { r r } 1 & - 4 \ - 2 & 9 \end{array} \right]$ and its inverse $A ^ { - 1 } = \left[ \begin{array} { l l } 9 & 4 \ 2 & 1 \end{array} \right]$ to decode the cryptogram $\left[ \begin{array} { r r } - 7 & - 8 \ 16 & 21 \end{array} \right]$.
A) ABLE
B) ACTS
C) ARMS
D) ALAS

Encode and Decode Messages -Use the Coding Matrix A=[1−4−29]A = \left[ \begin{array} { r r } 1 & - 4 \\ - 2 & 9 \end{array} \right]A=[1−2​−49​]

Encode and Decode Messages
-Use the Coding Matrix $A = \left[ \begin{array} { r r } 1 & - 4 \\ - 2 & 9 \end{array} \right]$