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#:
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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