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  1. 2.1: Introduction to Matrices - Mathematics LibreTexts

  2. Matrices - Math is Fun

  3. Intro to matrices (video) | Matrices | Khan Academy

  4. Study Guide - Introduction to Matrices - Symbolab

  5. Fundamentals of Matrix Algebra - Open Textbook Library

  6. 1: Introduction - Mathematics LibreTexts

  7. Introduction to matrices - Math Insight

  8. Introduction to the matrix | Matrices | Precalculus - YouTube