It's a system of plotting straight lines and curves on the Cartesian plane which consist of a horizontal x number line axis and a vertical y number line axis.
Both axes are perpendicular to each other at the point of origin that has the coordinates of (0, 0)
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It was conceived by the French mathematician Rene Descartes.
Euclid of Alexandria
a coordinate system is lines of longuitude and latitude that are used in a map to locate something. There is a coordiante in the Equatorial Coordinate System that is like longitude in the Geographical Coordinate System.....what is the coordinate? Celestial Equator?
Coordinate index ? Sure ! It's easy ... You just have to coordinate your index number !
A point's y coordinate is its vertical position, or how high or low it is.