Education Technology

Precalculus: Cryptology and Matrices
by Texas Instruments

Published on November 26, 2011


  • Students will use their knowledge of matrices and their inverses to encode and decode messages, solve systems of equations, and write equations for messages.
  • Students will be able to input their data into matrices and perform calculations on them.
  • Students be able to interpret the results of their calculations.
  • Students will utilize different methods to check the results of their calculations and verify their solutions.


  • decode
  • determinant
  • encode
  • identity matrix
  • inverse matrix
  • matrix

About the Lesson

This lesson involves using matrices to encode and decode a message.
As a result, students will:

  • Learn how matrices can be applied to real world problems.
  • Learn that (some) matrix multiplications can be "undone" by multiplying by an inverse matrix.