Any line that is drawn or printed is a real life approximation.
A line is an abstract geometric concept which has a length but no thickness. A line segment is of finite length. Since it is impossible to draw an infinitely long line, whatever is drawn is a segment. However, it is an approximation because at the microscopic, or submicroscopic level, it is impossible for it to have no thickness at all.
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I'm not really sure which line plot you mean so I assumed it was the x,y axis line plot. One example could be the shooting solution coordinates in a warship
A map is a good example.
the number of students depnds upon the classroom
this is one example of concurrent line .concurrent line- 3 or more lines that intersect in a certain point .
Any two points on a vertical line. For example, the line x=7 is a vertical line with undefined slope. Every point (7,y) where y is any real number, lies on the same line.