D
We can calculate the slope m using the gradient formula
m = ( y₂ - y₁ ) / (x₂ - x₁ )
with (x₁, y₁ ) = (2, 2 ) and (x₂, y₂ ) = (2, - 2 )
m = [tex]\frac{-2-2}{2-2}[/tex] = [tex]\frac{-4}{0}[/tex]
Since division by zero is undefined then the slope is undefined
