**1 Inequalities, Equations, and Graphs**

**Chapter Contents**

**1.3** The Rectangular Coordinate System

1.1 The Real Line

**INTRODUCTION** In calculus you will study quantities described by real numbers. Therefore, we begin with a review of the set of real numbers using the terminology and notation you will encounter in calculus.

▯ **Real Number System** Recall that the set *R* of **real numbers** consists of numbers that are either **rational** or ...

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