Pre-Calculus All-in-One For Dummies

Chapter 19

Making Matrices Work

IN THIS CHAPTER

Forming and operating on matrices

Creating matrices from equations

Putting matrices into simpler forms to solve systems of equations

A matrix is a rectangular array that displays numbers or variables, called elements. Matrices are most helpful when solving systems of equations — especially when there are three or more equations involved. The mathematical procedures performed on matrices allow you to do operations on the equations involved very quickly and efficiently. And, the best part: these procedures can also be performed on calculators and in computer programs!

Introducing Matrices: The Basics

In Chapter 18, you see how to solve systems of two or more equations by using substitution or elimination. But these methods get very messy when the size of a system rises above three equations. Not to worry; whenever you have four or more equations to solve simultaneously, matrices are a great option.

A matrix is a rectangular array of elements arranged in rows and columns. You use matrices to organize complicated data. Say, for example, you want to keep track of sales records in your store. Matrices help you do that, because they can ...