The slope of a vertical line is undefined. It either slants straight up or straight down-- you can not say which. The formula for slope does not work in this case because the denominator is zero.
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No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.
The slopes will be the same. It is also possible that both parallel lines have no slope defined - if they are vertical.
They are lines that are not horizontal nor vertical.
Vertical. Te horizontal like has zero slope ( no slope) and the vertical line has infinite (very very high) slope
A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.