No. Vertical lines are not.
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yes
Only if the two functions really represent the same function.
A function is a mapping between two sets, the domain and the range, such that each element in the domain is mapped to only one element in the range. This is true for all lines in a plane except those that are parallel to the y-axis. Thus, all non-perpendicular lines are functions but vertical lines are not functions.
They are all represented by straight lines.
The parallel lines represent scarification patterns.