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 Description  
 Coordinate Plane:  A two-dimensional region determined by a pair of axes and that uses numerical values to represent the location of an object.


This drawing shows an example of a Cartesian coordinate system. The horizontal purple line is the x-axis and the vertical green line is the y-axis. These axes are references from which we can uniquely define a point in the plane.

Together the axes separate the plane into 4 parts called quadrants. The quadrants are labeled as I, II, III, and IV. The picture below shows all of the four quadrants.