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Tool: Intercept of a line (Coordinate Geomtery) - Math Open Reference
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Go to: http://www.mathopenref.com/coordintercept.html (opens a new window)
Description:

An interactive applet and associated web page that demonstrate the intercept (b) of a line. The applet has two points that define a line. As the user drags either point it continuously recalculates the intercept, the point where the line crosses the y-axis at x=0. Can be used in conjunction with the slope to derive the equation of a line.

The grid, axis pointers and coordinates can be turned on and off. The intercept calculation can be turned off to permit class exercises and then turned back on the verify the answers. The applet can be printed as it appears on the screen to make handouts.

The web page has a full description of the concept of intercept, a worked example and has links to other pages relating to coordinate geometry.

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Technology Type: Flash 
Author: John Page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Line, Coordinate geometry
Algebra Finding Intercepts, Graphing