Because that is where the x and y axes intersect at right angles
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That point, (0,0) is called the origin
It means the coordinate (0, 0) - or in three dimensions, (0, 0, 0). That is, the origin, or starting point, of the coordinate system.
A point with a coordinate (0,0) is located at the origin. (x = 0, y = 0)
The origin is where the two intersect. This is where both number lines are 0.
The coordinate axes are the x and y axes that intersect each other at right angles at the point of origin (0, 0) on the Cartesian plane.