SOLUTION: Why the line x=4 is a vertical line
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Question 311155: Why the line x=4 is a vertical line
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
It's parallel to the y-axis, which is often called vertical.
It's parallel because for any value of y, x = 4. It goes thru the points
(4,0), (4,4), (4,100), any value of y. That makes it 4 units to the right of the y-axis, parallel to it --> "vertical"
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In 3 axis systems, the y-axis is sometimes horizontal and the z-axis if "vertical." It's an arbitrary assignment. If you graph x = 4 and it's vertical, then rotate your graph paper 90º, then it's horizontal. Use caution in calling it vertical.
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