Question

How do I find a perpendicular line to a vertical line graph eg: x=2?

Answer 1

Since you didn't just ask for the slope, you would need to know the value of some point on the line; for example `(a,b)`, in which case the answer would be `y=b`

Explanation:

All lines perpendicular to a vertical line are horizontal lines.

All horizontal lines have a slope of `0` (that is `y` is a constant).

Given that `y` needs to be a constant,
if the line passes through `(x,y) = (a,b)`
then the line must be
`color(white)("XXXX")` `y=b`

Answer 2

You have `y=k` where `k=`constant. For exanple, `y=2`

Explanation:

Your equation represents a vertical line passing through `x=2` so any horizontal line (with equation `y=k` where `k=` constant) will be perpendicular to it.