The property line for dwelling "A" butts up to the dwelling of"B". the land belongs to A and it goes on that way through out the neighborhood
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A single value for x and a single value for y represent a point, not a line. A point cannot have a slope.
A horizontal line has a slope of zero. The equation of a horizontal line is y = a.
Point, zero; line, one: length but no width
by zero line do you mean 0? or do you mean 0 with the slash in it like this /?
zero is horizontal, undefined is vertical