A slope is 0 if it is a straight horizontal line. A slope is undefined if it is a straight vertical line.
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The slope is 0. If it were vertical, the slope would be undefined. APEX ZERO
Vertical lines always have an undefined slope. Slope for y = f(x) is given by :slope = dy/dxdx is zero at any point along a vertical line, making the slope undefined along a vertical line.
It would be a undefined slope.There are four types of slope:Postive slope (when lines go uphill from left to right)Negative slope (when lines go downhill from left to right)Zero slope (when lines are horizontal)Undefined slope (when lines are vertical)
The slope of such a line is undefined: If you divide delta y / delta x for any two points, you get a division by zero.
The line rotates anti-clockwise, from a horizontal to a vertical position.