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A. Graphing Quadratic Inequalities in Two Variables

In Lesson 7.3, you learned about linear inequalities in two variables. Many of the same ideas also apply to quadratic inequalities in two variables. The solution region and the non-solution region are separated by a boundary that is defined by the corresponding quadratic function. As with linear inequalities, boundaries that are included in the solution region are represented with a solid curve and boundaries that are not included in the solution region are represented with a dashed curve. A test point can be used to determine which side of the boundary lies the solution region.