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Collinearity with the Casio ClassPad 
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Activity - check to see if three points are collinear. Methods:
1. Draw the line between two of the points and draw the third point: check to see if it lies on.
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2. Use the sequence() command to determine the curve through the 3 points:
3. Look at difference in y / difference in x
Repeat with a couple of different sets - some collinear some not.
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