In mathematics, abscissa (plural abscissae or abscissæ or abscissas) refers to the horizontal coordinate of a point in a two-dimensional rectangular Cartesian coordinate system. The term also refers to the horizontal axis (typically x-axis) of any two-dimensional graph. An ordered pair consists of two terms—the abscissa (horizontal, usually x) and the ordinate (vertical, usually y)—which define the location of a point in two-dimensional rectangular Cartesian coordinate system.
- For the point (2, 3), 2 is called the abscissa and 3, the ordinate.
- For the point (5, 15), 5 is called the abscissa and 15, the ordinate.
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