Question

How do you write an equation of a line passing through (1, -5), perpendicular to `x=4`?

Answer 1

`y = -5`

Explanation:

The equation `x = 4` describes a vertical line.

To have a perpendicular line it will be a horizontal line going through the `y` point for all `x`'s.

The perpendicular line will be `y = -5`