The Identity Matrix

Cramer's Rule for Two Equations

Solving a System Three Different Ways

The Inverse of a 2x2 Matrix

The Order of a Matrix and How to Add Matrices

The Identity Matrix: The "1" of Matrix Algebra

Cramer's Rule for solving 2x2 system of equations

Determinant of Matrices 2x2

Conditions to Multiply Matrices

Determinant of a 3x3 Matrix Example