AlgebraEasyEquation of a horizontal line
Algebra practice question
Which of the following is an equation of a horizontal line in the xy-plane?
- A. y = 3Correct
- B. x = 3
- C. y = x
- D. y = 3x
Answer: A. y = 3
y = 3 keeps y fixed for every x: a horizontal line.
Why the other answers are wrong
- B. x = 3
- x = 3 is vertical.
- C. y = x
- y = x rises at 45°.
- D. y = 3x
- y = 3x is a sloped line through the origin.
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