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P at (3, 2)

Here P is at (3, 2) and B is at (7, 6). We have a nice 45˚ path 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-B to test your predictions and to explore what is going on.

On the next page we start with P at (6, 2) and again think about moving it vertically.