Is the line with equation x = 4 horizontal or vertical?

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Answer 1 · 2015-07-22T14:35:05

Vertical

You can choose any value on the $y$ axis and $x$ will always be equal to $4$ :
enter image source here

Answer 2 · 2015-07-22T14:46:58

$x=4$ is vertical
$color(white)("XXXX")$ $color(white)("XXXX")$ assuming your X-axis is horizontal

$x=4$ is valid for all $(x,y)$ coordinates that are a distance of $4$ from the (vertical) Y-axis.
enter image source here