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Tutorial

What do the A and B represent? The letters A and B are capitalized because they refer to matrices. Specifically, A is the coefficient matrix and B is the constant matrix. In addition, X is the variable matrix. No matter which method you use, it’s important to be able to convert back and forth from a system of equations to matrix form.

**Example: **Be sure to follow this example using your calculator.

This is how the matrices would be set up.

Just follow these steps:

**1. ** Enter the coefficient matrix, A. Press to create a matrix from scratch or press to access a stored matrix. See the first screen below. Make sure that Matrix A is set as a 3 x 3.

**2. ** Press [] to find the inverse of matrix A. See the second screen below.

**3. ** Enter the constant matrix, B. Press to create Matrix B. See the third screen below. Make sure that Matrix B is set as a 3 x 1.

**4. ** Press to evaluate the variable matrix, X. The variable matrix indicates the solutions: x = 5, y = 0, and z = 1. See the third screen below. Remember that the answers for each variable will go in order - x, y, z.

Practice assignment w/ answer key