Nervous system.
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A coordinate plane! If it has one or more breaks in it is not a coordinate plane but only a part of one.
If the y axis is part of the Cartesian coordinate system, then the other coordinate is zero.Their x-axis value is 0.
If the coordinate of A is x, and that of the midpoint of AB, M, is m then the distance AM is m-x so the distance AB = 2*(m-x) So the coordinate of B is x + 2*(m-x) = 2m-x For coordinates in more than one dimension, apply the above rule separately for each dimension.
It is a point on the coordinate grid. The grid may be the Cartesian or coordinate plane, or its equivalent in 3 or more dimensions. It could also refer to a grid where the axes are not at right angles to one another (eg isometric grid).
That it is positioned on at least one axis of the coordinate system.