Asked by Aurelia

The question is:

What is the slope of a line that is parallel to a vertical line?

Would it be a slope of 0?

Thanks!
Answered by Bob
VERTICAL LINE: No slope (or "undefined" slope)
HORIZONTAL LINE: Slope=0

(by the way, a vertical line is "undefined" because the formula used to find the slope, (y2-y1)/(x2-x1), has a denominator of 0 when the line is straight up and down, and you can NEVER divide by 0)

Your answer is correct.
Answered by Bob
Sorry, I was thinking PERPENDICULAR to a vertical line, so the answer would NOT be 0 (a horizontal line), it would be undefined (another vertical line alongside the original vertical line).
Answered by Aurelia
I must have mixed the two up. Thank you!
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