The following TI-83 tutorials concern matrices:

Defining Matrices I

Using the Matrix Editor to define a matrix.

 Defining Matrices II

Define a matrix from the Home Screen.

 Matrix Addition

Add two matrices together.

Matrix Inversion

Find the inverse of a matrix.

Elementary Row Operations

The three elementary row operations on matrices.

Simplex Pivoting

Pivoting on a matrix entry. (Used in the Simplex Method)