Gradient of a line: The ratio of rise to the run is called gradient of a line or known as slope or gradiant of the inclined path and is denoted
m = rise / run
m = y / x = tan α
where y mean ⇑ up
and
x = run in path
where α ( alpha) is the inclination of the inclined path with positive x – axis
Gradient of a straight line joining two point
Slope line L with inclination α passes through two point
P ( x₁ , y₁ ) and Q ( x ₂ , y ₂) then the slope m of the line L is given by
m=y₂ – y ₁ / x ₂ – x₁ = tan α
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