Slope of a Line given points (-1, -1) and (-1, -3)

Given Coordinates: x₁ = -1  y₁ = -1,  x₂ = -1  y₂ = -3
Slope Formula: m  =  
Substitute the given coordinates into the Slope Formula and Simplify:m  =  
m  =  m  =  
m  =  undefined
Therefore, the Slope of a Line given points (-1, -1) and (-1, -3) is undefined
Note: Since x₁ = x₂ (-1 = -1), the slope of the line is undefined (m = undefined)