It is called the ORDINATE. The first is called the abscissa.
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A coordinate plane
Ordered Pair
The numbers in the parenthesis represent the ordered pair for x and y. The x axis is horizontal and the y axis is vertical. When plotting the ordered pair, move across the horizontal axis for the first number and along the vertical axis for the second number.
A coordinate plane has infinitely many ordered pairs: each and every point in the plane is represented by an ordered pair. There may be a small number of points that are identified for a specific reason: for example the vertices of a triangle or quadrilateral and so you may have a few ordered pairs that are specifically labelled.
They are coordinates that are plotted on the Cartesian plane.