Slope of a Line

In a coordinate system, the slope of a line is one of the main features that define the line. Slope of a line depends on the measure of the angle it forms with the x -axis. In algebra, the slope of a line is defined based on the coordinates of two points. Here, we present a simple and quick definition for slope using a trigonometric function.

The slope of a line is the tangent of the angle it forms with x -axis. That is, if a line AB forms a 50º angle with the x -axis, its tangent equals tan 50 = 1.20. So, the slope of the line AB is 1.20.