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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

What is the equation of the line parallel to the x-axis and four units above the x-axis?

(A) x = -4
(B) x = 4
(C) y = -4
(D) y = 0
(E) y = 4

答案和解析

答案：E

解析：

A line that is parallel to the x-axis and four units above the x-axis is the vertical translation of the x-axis four units upward. Since the x-axis is a horizontal line and has equation y = 0, it follows that the line parallel to the x-axis and four units above the x-axis has equation y = 4.