Graphing Linear Equations

Online

Holt Learning Online: Online Graphing Calculator

http://my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html

An online Graphing Calculator, that can be used to graph up to four equations simultaneously. Standard graphing calculator buttons are available to allow for simple input of an equation, or the equation could be entered manually. A table is provided to find solution sets to a particular equation, or to demonstrate the effects that changes in the independent variable have upon the dependent variable. The graph can also be used to simply plot points on the coordinate plane.

WebGraphing

http://webgraphing.com/

Webgraphing.com is an extensive collection of online graphing and equation plotting calculators.

Offline/Local

Microsoft Math (Win)

http://www.microsoft.com/math/default.mspx

Microsoft Math is a very versatile, all-in-one tool. It sports a 2D/3D graphing calculator for graphing equations and functions; a step-by-step math problem solver; a formula and equation library for quick access to commonly used equations and formulas; a triangle solver for exploring the multiple facets of triangles, such as sides and angles; a unit conversion tool; and handwriting support.

Grapher (Mac)

Grapher is located under UTILITIES in the Applications folder

Grapher is a 2-D and 3-D graphing program, located in the Utilities Folder, in Mac OS X. Simply type in an equation to see it graphed. You can graph multiple equations at one time.