Point plotting is an elementary mathematical skill required in analytic geometry.
To be able to plot points, one needs to first decide on a point in plane which will be called the origin, and a couple of perpendicular lines, called the x and y axes, as well as a preferred direction on each of the lines.
Also, one picks a segment in the plane which is declared to be of unit length.
Using rotated versions of this segment, one can measure distances along the x and y axes.
Having the origin and the axes in place, given a pair (x, y) of real numbers, one considers the point on the x axis at distance |x| from the origin and along the positive direction if x≥0, and the other direction otherwise.