x, y, and z ordinates from origin 0, x and y are two dimensional ordinates ie graph axis, z adds third dimension.
eg ordinates for point are say 10, 25, 15: start at 0, right for 10(x), left for 25(y), then vertically off the paper toward you for 15(z)
both turns are right angles
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The rectangular coordinate system is the basis for how we find locations on a map, for example (even though the earth is actually a sphere, this was a basis). I would say it is rather important.
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It's like cheese.
The origin is where the two intersect. This is where both number lines are 0.
A Cartesian coordinate system, or rectangular coordinate system, is a 2-dimensional coordinate system. The X-axis and Y-axis only intersect at one special point called the origin. This point has the coordinates of (0,0).Wikipedia has particulars, and a link is provided.