## Matrix Addition and Subtraction

A matrix is a rectangular array of numbers. In Chapter 2 we used matrices to store the coefficients and constants in a system of linear equations. For instance, the system of linear equations

corresponds to the augmented matrix

In this section, we’ll expand on this usage to use matrices to solve business applications.

**Read **in Section 3.1

- How is information organized in a matrix?
- How do you multiply a matrix by a scalar?
- How do you add matrices?
- How do you subtract matrices?

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