Precalculus with Calculus Previews, 6th Edition

9  Systems of Equations and Inequalities

Chapter Contents

9.1    Systems of Linear Equations

9.2    Determinants and Cramer’s Rule

9.3    Systems of Nonlinear Equations

9.4    Systems of Inequalities

9.5     Partial Fractions

Chapter 9 Review Exercises

9.1  Systems of Linear Equations

INTRODUCTION Recall from Section 2.3 that a linear equation in two variables x and y is any equation that can be put in the form ax + by = c, where a and b are real numbers and not both zero. In general, a linear equation in n variables x₁, x₂, …, x_n is an equation ...