A free web-based function graphing tool. Graph up to three different functions on the same axes. Functions can refer to up to three independent variables controlled by sliders. As you move the sliders, the graphs change in real time to reveal the effects of the variables.

Control the range of the sliders, the x,y axis limits, and line thickness. An optional vertical cursor line can be dragged laterally to show the values of the functions for that x value.

Grapher can be expanded to fill the whole screen - useful in a classroom using a projector or Smartboard. This resource is a component of the Math Open Reference Interactive Geometry project at http://www.mathopenref.com.