SOLUTION: Why is x=4 a vertical line?

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Question 192946: Why is x=4 a vertical line?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
x=4 for all values of y. That makes it parallel to the y-axis, or vertical.
You can plot any number of points:
(4,0), (4,4), (4,100), (4,-777), etc.