Exploring systems of linear equations

with Geometer's Sketchpad

How to draw a line through two points in GSP

The instructions here are for drawing a line through two points with fixed co-ordinates.
 

Select Create Axes from the Graph menu
Select Plot Points... from the Graph menu
Fill in the values of two of the points from your data
Because of the scale of the axes you won't be able to see points with large co-ordinates.  If you can't see your points, drag the Unit point towards the origin to change the scale.
If you still can't see your points, use the scroll bars to change the part of the plane you can see.
Select the Line tool from the tool bar at the left.
Select your two points, by:
First selecting the select tool
Then clicking on one point, and holding down Shift when clicking on the second one.
Select Line from the Construct menu
Voila! You have your line!
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[Copyright -- David A Reid] [Acadia University]