A vertical line is NO SLOPE to ski on.
That's how my Algebra teacher taught us to remember it.
Slope is rise/run with run=0, so the slope is infinity or "No Slope"
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A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.
Vertical. Te horizontal like has zero slope ( no slope) and the vertical line has infinite (very very high) slope
Undefined.
A vertical line.
No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.