Guess the Equation of the Line

Consider the graph of a linear function in the applet below. 

1. Move sliders a and b to guess the equation of the graph. 
2. Click the check box to check your answer. 
3. Click the New Line button to generate a new line.

This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com
Guillermo Bautista, Created with GeoGebra