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Yes and its imaginary axis is z. ============================ I have a 3-dimensional Cartesian coordinate system with all three axes real. Its origin is the point where the floor and two walls of my bedroom meet.
The Cartesian coordinate system can be used in 3 or more dimensions.
Because the x coordinate is always followed by the y coordinate as for example the coordinate of (3, 6) is 3 of x horizontally and 6 of y vertically on the Cartesian plane
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