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P at (6, 2)

Here P is at (6, 2) and B is at (8, 6). We have an initial path of gradient 2 and the ball returns to P.

Imagine moving P vertically (eg up or down one unit). What happens to the desired position of B?
Can you find a pattern or rule?
Use the worksheet JAVA-C to test your predictions and to explore what is going on.

On the next page we look at this same situation in a new (and hopefully illuminating) way.