1. SLOT Week 9 – Day 1

2. Using Matrices to Encode
Secret Message: MATH

3. Encoding Matrix
−3 1 2 −1 Multiply message by encoding matrix −3 1 2 −1 x = −38 −

4. How do we decode a message?
If we know the encoding matrix and the encoded matrix, how can we find the message?
−3 1 2 −1 x M = −38 −
We need to find the inverse of the encoding matrix

5. Decoding the Message Find the inverse of −3 1 2 −1
Determinant = (-3)(-1) – (2)(1) = 3-2 = 1
Adjoint Matrix = −1 −1 −2 −3

6. Using the inverse to discover the message
Inverse Matrix = −1 −1 −2 −3
Multiply the inverse of the encoding matrix by the encoded message
−1 −1 −2 −3 x −38 − =

7. TOP SECRET
Encoded Message: − Encoding Matrix: 4 − What is the top secret message that Mrs. Maynor and I wanted to share with you?

8. BAZINGA
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