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 Related Terms
 Domain:  The set of x-coordinates of the set of points on a graph; the set of x-coordinates of a given set of ordered pairs. The value that is the input in a function or relation.
Ordered Pair: A pair of numbers, (x, y), that indicate the position of a point on a Cartesian plane.
Point: One of the basic undefined terms of geometry. A point has no length, width, or thickness, and we often use a dot to represent it.
y-coordinate: The second number in an ordered pair; the position of a point relative to the horizontal axis.
Range: The y-coordinates of the set of points on a graph. Also, the y-coordinates of a given set of ordered pairs. The range is the output in a function or a relation.
Relation: A rule that gives an output number for every valid input number.