Using the SLOPE Tool & FractionText Command: GeoGebra Beginner Exercise 15

Silent screencast demonstrates how to use GeoGebra's SLOPE tool and FractionText command.  Here, we illustrate how students can use GeoGebra to quickly discover that, when graphing in the coordinate plane, parallel lines have the same slope.  We'll also discover that any pair of non-horizontal+vertical perpendicular lines have slopes that are opposite reciprocals.  Engage here:

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