AlgebraEasyEquation of a horizontal line
Algebra practice question
Which of the following equations has a graph in the xy-plane that is a horizontal line?
- A. y = 4Correct
- B. x = 4
- C. y = 4x
- D. y = x + 4
Answer: A. y = 4
y = 4 keeps y fixed for every x: a horizontal line.
Why the other answers are wrong
- B. x = 4
- x = 4 is vertical.
- C. y = 4x
- y = 4x rises with slope 4.
- D. y = x + 4
- y = x + 4 rises with slope 1.
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