AlgebraEasyGraph of x equals a constant
Algebra practice question
Which of the following describes the graph of x = −2 in the xy-plane?
- A. A vertical line 2 units to the left of the y-axisCorrect
- B. A horizontal line 2 units below the x-axis
- C. A line through the origin with slope −2
- D. A single point on the x-axis
Answer: A. A vertical line 2 units to the left of the y-axis
Every point with x = −2 lies on one vertical line, left of the y-axis.
Why the other answers are wrong
- B. A horizontal line 2 units below the x-axis
- That would be y = −2.
- C. A line through the origin with slope −2
- That would be y = −2x.
- D. A single point on the x-axis
- Infinitely many points have x = −2.
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