If you dont have slope then you cant tell
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A vertical line has an undefined slope.
An undefined slope is vertical.
The equation of a line with an undefined slope is x = a.
The slope of a vertical line is undefined. Horizontal slope is 0.
Undefined slope is when a line is exactly on the y-axis, for reasons unknown, the slope of a line on the y-axis cannot be determined, so therefore it it "undefined." A line with no slope is a line with a slope of zero. In order for a line to have a slope of zero, it must be directly on the x-axis, meaning it is horizontal. Horizontal lines are straight and have no slope