Cartesian graph: find the function (A)
This is the first task in a series of Starter activities in which students are shown a movie of a point on a Cartesian graph as its x and y coordinates change. Students are asked to identify the function relating x and y.

The tasks in this series correspond exactly to the tasks in the series 'Mapping diagram: find the function'.

The point, and its coordinate values, are shown only fleetingly in the movie. Run the movie several times without pausing and ask students to describe what they see. 'How does the point move?'

Now PAUSE the movie at judicious moments. 'What is the relation between x and y?'

NOTE: If needed, you can download a free copy of the QuickTime movie player from here:


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  • Cartesiangraph-function-A-guide.pdf
  • Cartesiangraph-function-A-worksheet.pdf

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Created: Jan 26, 2015

Updated: Feb 22, 2018

mov, 1 MB


pdf, 176 KB


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Creative Commons "Sharealike"