alt tags for graphs

Hi all,
I'm working on a project to teach mathematical concepts.  What is the best manner to describe graphs, such as the one below
[File:Intercepts_Axis_Graph.JPG]<https://wiki.ncscpartners.org/mediawiki/index.php/File:Intercepts_Axis_Graph.JPG>

F. Darrell Mattingly, Jr.

Web Designer/Developer, ILSSA<http://www.ihdi.uky.edu/ilssa/>/NCSC<http://www.ncscpartners.org/>

University of Kentucky<http://www.uky.edu/>, Human Development Institute<http://www.ihdi.uky.edu/>
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--Darrell Waltrip

Received on Thursday, 28 March 2013 18:44:18 UTC