SOLUTION: why the line x = 4 is a vertical line.

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Question 262127: 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!
For any value of y, x = 4. That makes it parallel to the y-axis, which is commonly referred to as vertical.
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The line is always 4 units to the right of the y-axis.