Question

Line N passes through the points (–1, 4) and (–1, –4).



Which is true of line N?
Line N is a vertical line with an undefined slope.
Line N is a vertical line with a slope of zero.
Line N is a horizontal line with an undefined slope.
Line N is a horizontal line with a slope of zero.

Answer 1

Answer:

Line N is a vertical line with an undefined slope.

Step-by-step explanation:

P(- 1, 4) and Q(- 1, - 4)

$m_{PQ}$ = $\frac{-4-4}{-1-(-1)}$ = - $\frac{8}{0}$ ⇒ line is vertical and  $m_{PQ}$ is undefined

"Line N is a vertical line with an undefined slope."