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Concept

Collinear

Any set of two or more points that lie on the same line are said to be collinear.
Collinear points A, B, and C lie on a line, with non-collinear point D positioned below the line.

In this illustration, and are all considered to be collinear. In contrast, does not lie on the same line as the other points.

Collinear and Non-Collinear Points
However, since any two points can be used to define a line, is still considered to be collinear with the other points individually. Therefore, there are four sets of collinear points on the graph.