Answer:
slope is undefined
Explanation:
calculate the slope m using the slope formula
m =

with (x₁, y₁ ) = (- 6, 1 ) and (x₂, y₂ ) = (- 6, - 4 )
substitute these values into the formula for m
m =
=
=

in mathematics division by zero is undefined
then the slope of the line is undefined