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In this video I will explain Postulate 1:The Ruler, or Number Line, Postulate – points on a line have corresponding points on a number line such that they can have “x-values” called “coordinates” of the points (x1, x2, x3,...) and such that the distance between any 2 points A and B is called the “length”.

Next video in this series can be seen at:
https://youtu.be/xaZqQtqFLTc