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Coordinate System

  • Definition: Every point P in the xy-plane corresponds to a unique pair of real numbers (x, y), where x is a number on the horizontal x-axis and y is a number on the vertical y-axis; 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 xy-plane would be labeled (3,2).

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