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Elementary Algebra 2e

Introduction

Elementary Algebra 2eIntroduction
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This is a photo of a two story home with several large windows.
Figure 5.1 Designing the number and sizes of windows in a home can pose challenges for an architect.

Chapter Outline

5.1 Solve Systems of Equations by Graphing
5.2 Solving Systems of Equations by Substitution
5.3 Solve Systems of Equations by Elimination
5.4 Solve Applications with Systems of Equations
5.5 Solve Mixture Applications with Systems of Equations
5.6 Graphing Systems of Linear Inequalities

An architect designing a home may have restrictions on both the area and perimeter of the windows because of energy and structural concerns. The length and width chosen for each window would have to satisfy two equations: one for the area and the other for the perimeter. Similarly, a banker may have a fixed amount of money to put into two investment funds. A restaurant owner may want to increase profits, but in order to do that he will need to hire more staff. A job applicant may compare salary and costs of commuting for two job offers.

In this chapter, we will look at methods to solve situations like these using equations with two variables.

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