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## Chapter 2Graphs of Linear Equations and Inequalities

2.1 Graphing Equations

2.2 Writing Linear Equations

2.3 Direct Variation

2.4 Scatter Plots and Lines of Regression

2.5 Graphing Linear Inequalities

### 2.1 Graphing Equations

In Chapter 1, you solved equations and inequalities in one variable and illustrated the solutions on a number line. An equation or inequality in two variables often uses the variables x and y, and the solutions are the ordered pairs (x, y) that make the equation or inequality true. The ordered-pair solutions can be graphed on a coordinate plane.

#### Linear vs. Nonlinear

A linear equation is an equation whose solutions form a straight line on a graph. An equation that produces a graph that is not a straight line is nonlinear.

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