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Horizontal : y = 0Vertical: x = 2.
For vertical lines, when you try to figure out the slope, you get zero in the denominator - in other words, a division by zero.
horizontal lines are lines which may be at the angle of 00,1800,3600.if vertical lines stand on horizontal lines it is in the angle of 900
Non-vertical lines could be slanted or horizontal.
my pregnancy test positive result should be vertical but is horizontal