http://www.geogebratube.org/material/show/id/444 (Download GeoGebra file)
screencast for making this file
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Key Stage 3 (Junior Secondary) > 3.2 Measures, Shape & Space 度量、圖形與空間 > Coordinates Geometry of Straight Lines 直線的坐標幾何 >
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Key Stage 3 (Junior Secondary) > 3.2 Measures, Shape & Space 度量、圖形與空間 > Coordinates Geometry of Straight Lines 直線的坐標幾何 >
Calculate slope from co-ordinates
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