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they mean coordinate planes.. those are the 2 numbers in the parenthesis when u have a coordinate plane on a graph table. an ordered pair is (1,4) the number on the x and y axis (x,y)
Two lines that lie on different planes but are not parallel.
Yes, almost all the time. And when it is not coordinate planes it is coordinate hype-spaces (more than just the 2 dimensions that the coordinate plane allows).
Yes, they are.
The place of 0o , in the very center, the origin on a coordinate plane, line, etc.