It is any non-zero number.
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Undefined slope is a vertical line along the horizontal point of origin., the slope would have a denominator of zero, which is undefined.
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.
positive slope negative slope undefined slope zero slope
A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.
The function is not defined at any values at which the denominator is zero.