Straight Lines – Notes

Slope of a Line

The angle made by a straight line in the anti-clockwise direction with the x-axis is called inclination.

Slope of a line (m) = tan q

Where q = inclination of the line

If q = 0⁰

Slope (m) = 0

If q = 90⁰

Slope (m) is not defined.

The slope of a line passing through points (x₁, y₁) and (x₂, y₂) is