You do not have 3 coordinates in the Cartesian plane. The Cartesian plane is a plane and is therefore 2 dimensional. In 2 dimensional space you require only 2 coordinates. 3 coordinates are required to locate a point in 3-dimensional space but then it cannot be a Cartesian PLANE.
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The cartesian coordinates are plotted on the cartesian plane
The coordinates of (-1, 3) lie in the 2nd quadrant on the Cartesian plane
The x coordinates are horizontal whereas the y coordinates are vertical on the Cartesian plane.
They are its coordinates in the Cartesian plane.
The Cartesian coordinates.