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

1 answer:

3 0

The line Y = 1 is a horizontal line; its slope is zero.

A line perpendicular to Y = 1 is a vertical line.
Its slope is undefined.
(This does NOT mean that it's infinite, or anything else.
The slope of a vertical line is undefined. It doesn't have
a name or a symbol. It's nothing.)

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