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I just made up a way of secretly communicating with people. You'll probably want to have a basic understanding of simple algebra.
The letters of the alphabet are first arranged into a 5x6 grid (with the last four spaces blank) as shown:
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The person giving the code must find some way of communicating the slope (if others know how to use this code, then it would be best to secretly communicate the slope). This is essential.
Each letter consists of two numbers. The first number is the Y-Intercept (b). The second number is the X value. You plug the X value into the line completed by the Y-Intercept, and it gives you a letter.
For example, if my slope was 1:
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And you were given this code:
22142121-14 then it would translate into "HELLO." You would go to the Y intercept 2, and follow the corresponding line over 2 to get "H" etc.
If you understand it then try to decode this, with the Slope being 1:
1340 -34-1410 325003 02145023 -242213-13 -34-1410 500214 211414-24
You can do it with just about any simple slope. You can do it with 1/3 or -3/2, etc. Here are some examples of other slopes:
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Try decoding this in 0.5 slope:
342.51402214045004