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Master Math: Algebra 2 by Mary Hansen

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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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