Thinking about resources to show students how to graph linear inequalities, I can use Autograph in the classroom as I often do but I am always keen to show them resources they can use at home.

The **Desmos graphing calculator** handles inequalities very well, unlike many free graph plotters it is easy to plot lines of the form x=k. Click on this image to see these inequalities on the Desmos calculator. See also **this post** on Mathematics for Students.

Experiment with these inequalities on the Desmos graphing calculator.

**The Holt Online graphing calculator** can deal with inequalities (though it cannot plot line of the form x=k) and gives a very clear display.

To enter an inequality, click on the equals sign, then select the required choice:

Up to four inequalities can be entered.

I am puzzled by WolframAlpha currently as I thought this would be an obvious resource to use. The inequalities examples **here** are fine, however I don’t think this **inequality plot** for x+y<5 would help my students much!