数学题目

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 = negative 4
(B) x = 4
(C) y = negative 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.