Algebra practice question

Answer: A. A horizontal line through the point (0, 4)

y = 4 for every x: a horizontal line 4 units above the x-axis.

Why the other answers are wrong

B. A vertical line through the point (4, 0)

A vertical line through (4, 0) is x = 4.

C. A line through the origin with slope 4

y = 4x passes through the origin with slope 4; y = 4 has slope 0.

D. A single point at (0, 4)

Every x gives y = 4, so the graph is a whole line.

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