*y*= - 1. Two points are constructed -- Point

*M*on (0,1) and point

*P*on (0,-

*n*).

Fold the paper through

*P*(by moving point

*P*in the applet) such that point

*M*is on

*y*= -1 (by moving point

*Q*in the applet).

**Problem:**Prove that if point

*P*is at (0,-

*n*), then the intersection of the fold and the

*x*-axis is at .

The discussion of the mathematics behind this applet and the ggb file will be available for download this week at Mathematics and Multimedia.

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