http://www.greenemath.com/
In this lesson, we will learn two methods to graph a linear inequality in two variables. First, we will learn how to use the test point method. This method tells us we can graph the boundary line and then test a point on either side. This will allow us to find the solution region and non-solution region. Alternatively, we can solve the inequality for y, graph the boundary line and then shade above the line for a greater than or below the line for a less than.
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