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Post date:  7/27/2013 
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Coordinate System

Definition: Every point P in the xyplane corresponds to a unique pair of real numbers (x, y), where x is a number on the horizontal xaxis and y is a number on the vertical yaxis; for this reason, we commonly use the notation “P = (x,y).”
Source: "Precalculus" by David H. Collingwood and K. David Prince at the University of Washington

Example: A point that is 3 units to the right and 2 units above the origin of the origin on the xyplane would be labeled (3,2).
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