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Examples of linear inequalities
x > 3
3x ≤ -1
Graphing linear inequalities
To graph all the numbers greater than, say, 2, make an open circle at 2, and draw an arrow to the right, like this:
To graph all the numbers less than or equal to, say, 1, make a closed circle at 1, and draw an arrow to the left, like this:
To graph all the numbers that are greater than 1 and less than or equal to 2, use a combination of open and closed circles:
The webmaster and author of this Math Help site is Graeme McRae.