下面是2013年3月8日的SAT官方每日一题的内容，是关于数学方面的，题型是选择。SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。下面我们就一起来看一下这个SAT官方每日一题吧。

　　SAT官方每日一题之数学---选择：

　　Mathematics > Standard Multiple Choice

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

　　In the-plane, linepasses through the pointsand. Lineis perpendicular to line. What is the slope of line?

　　(A) 

　　(B) 

　　(C) 

　　(D) 

　　(E) 

　　The correct answer is B

　　Explanation

　　Linepasses through the pointsand, so the slope of lineis equal to. Linesandare perpendicular, so the slope of lineis equal to the negative reciprocal of the slope of line. Therefore, the slope of lineis.

　　下面是一道和SAT官方每日一题相似的题目，供大家练习：

　　A machine can insert letters in envelopes at the rate of per minute. Another machine can stamp the envelopes at the rate of per second. How many such stamping machines are needed to keep up with inserting machines of this kind? 

　　Answer Choices

　　(A)  

　　(B)  

　　(C)  

　　(D)  

　　(E)  

　　The correct answer is A

　　Explanation

　　First you can change minute to seconds so that the ratios are both in envelopes per second. One inserting machine inserts letters at the rate of per seconds, or per second. So machines would insert letters per second.

　　Let be the number of stamping machines needed to keep up with inserting machines. Then, since one machine stamps envelopes per second, machines stamp envelopes per second. You can write the equation , which gives .　

　　以上就是关于2013年3月8日SAT官方每日一题中数学部分的详细内容，包括了题目和选项以及答案，后面附有一道相关的练习题。大家可以在备考SAT的过程中关注SAT每日一题的内容，这样就可以更好有不间断的练习，也就能在日积月累的过程中得到提高。