Explain why the slope of a horizontal line is zero, and the slope of a vertical line is undefined.

The slope is the tangent of the enclosed angle. Tan = vertical side divided by horizontal side. With a horizontal line, the verticle side is zero and zero/any number is zero.
For the vertical line, the horizontal side is missing (zero) and any number divided by zero is undefined.

Ask a New Question or answer this question.

Similar Questions

Which statement is correct?A horizontal line has no slope. A vertical line has a slope of zero. A line that rises from left to
1. 1 answer
Which line on the graph below has an undefined slope?On a coordinate plane, line Q is horizontal, line P has a positive slope,
1. 1 answer
Complete this sentence with the correct choice: y = 4 is a horizontal line with ________.a.undefined slope. b.a slope of 4. c.a
1. 0 answers
Line N passes through the points (–1, 4) and (–1, –4).A coordinate plane. Which is true of line N? Line N is a vertical
1. 1 answer