Stage: 4 Challenge Level: 
- What happens if one coordinate is twice the other, or three times, or four... times?
- What happens if the coordinates have a factor of two or three or four... in common?
- What happens if the coordinates are coprime (for example (9,8))?
Linear functions. Mathematical reasoning & proof. Reflections. smartphone. Limits. Making and proving conjectures. Manipulating algebraic expressions/formulae. Coordinates. Calculus generally. Generalising.
Published October 2000,January 2009.
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