What is the slope of a line that is perpendicular to a slope of 0?
That is the only slope which cannot be defined by a number!
A line with a slope of zero is a horizontal line where, for any change in x, the change in y is always 0.
The line perpendicular to this is a vertical line which has a slope which is 'undefined'. For any change in y, the change in x is always 0, but we cannot divide by 0.
A line that has a slope of
A slope of
An undefined slope is a vertical line with no run. This line is represented as