2016年1月25日SAT官方每日一題

　　標題範例：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

　　(D) y=0

　　(E) y=4

　　謎底：E

　　【剖析】A line that is parallel to the x-axis and four units above the x-axis is the vertical translation of the -xaxis 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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