This applet illustrates the meaning of the slope and intercept parameters of a straight line, by graphing the line they define, and allowing you to change them as you wish.
You can change the slope a and y-intercept b by moving the sliders or by clicking inside the circles that contain arrows.
This tool uses JQWidgets extensively. Please verify their copyright.
Developed by Daniel Kleitman and Jean-Michel Claus.
Line is defined by: y = ax + b