**Week 1: Square Dance**

This puzzle is as follows:

For the unit square shown above with vertices at (0,0), (1,0), (0,1) and (1,1), how many different types of functions can you find that go through at least 2 points?

**Teacher notes:**

Level of difficulty: Accessible for strong SL and all HL students.

Syllabus knowledge required: Functions and transformations and/or regression techniques.

This would be a good starter which could either be done as a non GDC exercise, or using Desmos regression depending on what syllabus point you intend to support. It would be a useful exercise to support the coursework.

**Solutions:**

There are clearly an unlimited number of solutions. Here are a few:

You can download a pdf of the problem and the solution here.

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