Two collinear vectors Is it just parallel? Are two modules equal

Parallel is OK. It doesn't need the modules to be equal, because the vectors can be translated (that is, they can coincide after translation is equal vectors). Therefore, if they are parallel and the modules are equal, they will become equal or opposite vectors

How do the coordinates of two points represent vectors

Subtract the coordinates of these two points
If a (1,3) B (2,4), then the vector AB can be expressed as: the vector AB = (2-1,4-3) = (1,1)
The vector Ba can be expressed as: vector Ba = (1-2,3-4) = (- 1, - 1)

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