Algebra practice question

Answer: A. y = 4

y = 4 is a horizontal line: every point has the same y-value, so it doesn't rise or fall — slope 0.

Why the other answers are wrong

B. x = 4

x = 4 is a vertical line, whose slope is undefined.

C. y = 4x

y = 4x has slope 4.

D. y = x + 4

y = x + 4 has slope 1.

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