Question

How do you write an equation of a line Perpendicular to y=3 passing through P(-2,4)?

Answer 1

`y=3` means a horizontal line (no `x`-influence).

Explanation:

So the perpendicular is a vertical line and thus of the form `x=a`
Since all `x`'s on this line are the same (including `x_P`), the line has the equation `x=-2`