Yes and its imaginary axis is z.
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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.
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The Cartesian coordinate system can be used in 3 or more dimensions.
Possibly because the first time that pupils are introduced to the name and concept it is has only two dimensions. These are usually represented as horizontal (x) and vertical (y) coordinates. Actually, many children meet the concept - in its 1-dimensional form - as the number line. It is not called a Cartesian coordinate system then, and they make only simple use of it. The Cartesian coordinate system is normally extended to 3-dimensional space in high school coordinate geometry when it is obviously not called a plane, and to multi-dimensional hyperspaces in advanced mathematics or physics.
3
Hey, With 2 axes its x and y with 3 its x,y and z Toby
The most obvious is to plot relationships between one quantity and another. If for every thing you sell, you make 3 dollars, then you could express that as the equation y=3x and plot that using the Cartesian coordinate system. (where y would represent dollars and x would represent items sold)