Slope of a Line given points (1, 2) and (2, -1)

Given Coordinates: x₁ = 1  y₁ = 2,  x₂ = 2  y₂ = -1
Slope Formula: m  =  
Substitute the given coordinates into the Slope Formula and Simplify:m  =  m  =  
m  =  -3
Therefore, the Slope of a Line given points (1, 2) and (2, -1) is equal to -3