The pair of numbers used to locate a point on a grid is called coordinate points.
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Ordered pair
A point.
Coordinate plane
It is a point on the coordinate grid. The grid may be the Cartesian or coordinate plane, or its equivalent in 3 or more dimensions. It could also refer to a grid where the axes are not at right angles to one another (eg isometric grid).
Coordinate graphing sounds very dramatic but it is actually just a visual method for showing relationships between numbers. The relationships are shown on a coordinate grid. A coordinate grid has two perpendicular lines, or axes, labeled like number lines. The horizontal axis is called the x-axis. The vertical axis is called the y-axis. The point where the x-axis and y-axis intersect is called the origin.