AlgebraEasySlope of a horizontal line
Algebra practice question
In the xy-plane, a line has slope 0. Which of the following must be true about the line?
- A. It is horizontal.Correct
- B. It is vertical.
- C. It passes through the origin.
- D. It rises to the right.
Answer: A. It is horizontal.
Slope 0 means no rise for any run: a horizontal line.
Why the other answers are wrong
- B. It is vertical.
- A vertical line's slope is undefined, not 0.
- C. It passes through the origin.
- A horizontal line need not pass through the origin (for example y = 4).
- D. It rises to the right.
- A rising line has positive slope.
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