一道SAT数学题及解法

2022-06-07 18:15:50

  下面是一道

  Which of the following inequalities is graphed below?

  (A)y > –2x – 2

  (B)y ≥ –2x – 2

  (C)y < –2x – 2

  (D)y > x – 2

  (D)y > – x – 2

  Correct Choice:A

  Explanation:

  The slope of the line pictured is –12⁄6 = –2. The y-intercept of the line pictured is –2. So the equation of the line pictured is y = –2x – 2. This leaves three choices. The line in the picture is dotted; this means that the inequality is either < or >, not ≤ or ≥. Now we have two choices left.

  Because the region to the right and above is shaded, > is the correct inequality, but just to make sure, plug in a point or two. In this case, try the origin, (0,0). It is in the shaded region, and must therefore satisfy the inequality. Which inequality does is satisfy? It satisfies y > –2x – 2, so this is the correct choice.

  以上就是关于这道SAT数学数学题和解法的全部信息,对于题目和后面所附的答案都是以英语的形式进行的,所以大家在备考SAT数学题的时候,不仅仅要关注数学本身,还要理解表达所用的英语的真正含义,只有这样,大家才能真正理解SAT数学题的含义,才能真正拿到高分。

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