SOLUTION: Why the line x=4 is a vertical line

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Question 524097: Why the line x=4 is a vertical line
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Why the line x=4 is a vertical line
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For all values of y, x=4. It's parallel to the y-axis.
That's often referred to as "vertical", but that can change if you have a 3-space system.