SOLUTION: Why is the line x=4 is considered a verticle line? why is x always vertical and y is always horizontal?

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Question 465038: Why is the line x=4 is considered a verticle line? why is x always vertical and y is always horizontal?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
x horizontal and y vertical are arbitrary assignments.
When we do 3-space graphs (x-y-z) usually z is vertical.
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If the orientation of the x-y plane is such that y is vertical, then x=4 is vertical, since it's parallel to the y-axis.