Graphing Systems of Inequalities

To graph systems of inequalities there are certain rules that must be followed. First, solid lines are used when the inequality could be equal to, dashed lines are for strict inequality. Second, when a line is in slope-intercept form, shading is above the line when it is greater than and the shading is below the line when it is lesser than. When a line is in standard form, the shading is the same as it is in slope-intercept form if the coefficient of the y-variable is positive, otherwise it is reversed. When working with standard form, it is sometimes necessary to choose better numbers to ensure the graph is precise.