AlgebraEasy–MediumEquation of a horizontal line
Algebra practice question
In the xy-plane, a line passes through the points (1, 4) and (7, 4). Which equation represents the line?
- A. y = 4Correct
- B. x = 4
- C. y = x + 3
- D. x + y = 5
Answer: A. y = 4
Both points have y = 4, so the line is horizontal.
Why the other answers are wrong
- B. x = 4
- x = 4 is a vertical line; the points have different x-values.
- C. y = x + 3
- (7, 4) is not on y = x + 3.
- D. x + y = 5
- (7, 4) does not satisfy x + y = 5.
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