Question

The slope of a vertical line is​ _______; the slope of a horizontal line is​ _______.

Answer 1

Answer: Below

Explanation:

The slope of a vertical line is​ undefined.

The slope of a horizontal line is​ zero.

Vertical Lines:

• have a run of 0, making the slope
  `(rise)/(0)`, which is undefined.

Horizontal Lines:

• have a rise of 0, making the slope
  `(0)/(run)`, which simplifies to zero.

(remember: slope = rise/run)