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SAT官方每日一题附答案和解析[数学](2015年2月24日)
日期:2015-02-25 10:54

(单词翻译:单击)

每日一题

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.

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重点单词
  • verticaladj. 垂直的,顶点的,纵向的 n. 垂直物,垂直的位
  • horizontaladj. 水平的,横的 n. 水平线,水平面
  • paralleladj. 平行的,相同的,类似的,并联的 n. 平行线(
  • multipleadj. 许多,多种多样的 n. 倍数,并联
  • equationn. 相等,方程(式), 等式,均衡