Find the slope of the line through the pair of points. a(2, –3), p(2, 9)

Set:

(x₁ , y₁) = (2, -3)

(x₂ , y₂) = (2, 9)

Note that the equation is:

(y₂ - y₁)/(x₂ - x₁) = slope

Plug in.

(9 - (-3))/(2 - 2) = 12/0

Undefined, which means the line would be vertical.

hope this helps

a is the right answer