AlgebraEasyEquation of a vertical line through two points
Algebra practice question
In the xy-plane, the points (1, 2) and (1, 5) both lie on the same vertical line. What is the equation of that line?
- A. x = 1Correct
- B. y = 1
- C. y = x
- D. x = 2
Answer: A. x = 1
Both points have x-coordinate 1, and a vertical line keeps x fixed: x = 1.
Why the other answers are wrong
- B. y = 1
- y = 1 is horizontal and passes through neither point.
- C. y = x
- y = x passes through neither point.
- D. x = 2
- The points have x = 1, not 2.
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