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On the basis of the information and context provided in the question, the answer must be "vertical lines".
On a vertical axis you should label it the "y-axis". Then make sure to put the numbers needed on the line! :)
The web should be in vertical.
my pregnancy test positive result should be vertical but is horizontal
Depends on whether it is vertical or horizontal. If it is vertical, it is undefined. If it is horizontal, it is zero.