Inequalities are mathematical sentences comparing two quantities that are not equal (or possibly not equal). There are five inequality symbols:
|is not equal to|
|is less than|
|is greater than|
|is less than or equal to|
|is greater than or equal to|
Graphing Inequalities in One Variable
The solutions of inequalities can be graphed on the number line as rays . If the inequality is "strict" ( or ), we use an open dot to indicate that the endpoint of the ray is not part of the solution. For the other types of inequalities ( and ), we use a closed dot to indicate that the endpoint is part of the solution.