A line in the euclidean sense is defined as the shortest distance between two points. It is defined to be in 1 direction only, i.e. infinitely thin but also infinitely long. In the Cartesian coordinate system, it is usually described as an equation in x and y of the form $y=mx+b$, where m is the slope of the line and b is the y-intercept. Any two points define a line, and given specific $(x_1,y_1)$ $(x_2,y_2)$ one can solve for the line's equation.


Example Problem

See also

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