Abscissa and ordinate Abscissa and ordinate In mathematics, the abscissa (; plural "abscissae" or "abscissæ" or "abscissas") and the ordinate are respectively the first and second coordinate of a point in a coordinate system. The abscissa of a point is the signed measure of its projection on the primary axis, whose absolute value is the distance between the projection and the origin of the axis, and whose sign is given by the location on the projection relative to the origin (before: negative; after: positive). The ordinate of a point is the signed measure of its projection on the secondary axis, whose absolute value
Graph of a function Graph of a function In mathematics, the graph of a function "f" is, formally, the set of all ordered pairs , such that "x" is in the domain of the function "f", and, in practice, the graphical representation of this set. If the function input "x", and the values "f"("x"), are real numbers, the graph is a two-dimensional graph, and, for a continuous function, is a curve. If the function input "x" is an ordered pair of real numbers, the graph is the collection of all pairs . These pairs can be identified with the ordered triples . For a