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## 1 Inequalities, Equations, and Graphs

### Chapter Contents

**1.1** The Real Line

**1.2** Absolute Value

**1.3** The Rectangular Coordinate System

**1.4** Circles and Graphs

**1.5** Algebra and Limits

Chapter 1 Review Exercises

### 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 ...