Question

What is the slope of a line that is perpendicular to the line y = 1?

Answer 1

Undefined

Explanation:

The slope of any horizontal line is zero, and that is the case here, The line y=−1 has slope 0 so any line perpendicular to it will have undefined slope.. If you try to evaluate −1m , it involves division by 0 , which has undefined result.

Answer 2

m = -1/0

That is the only slope which cannot be defined by a number!