SAT官方每日一题：2011年8月26日
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2011年8月26日
考试类型:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
In the figure above, which quadrants contain pairs 
that satisfy the condition 
?
A.
B. 
and 
only
C. 
and 
only
D.
E. 
, 
, 
, and 
正确答案:C
解析:
In order for 
to satisfy 
, it must be true that 
and 
are equal to each other and not equal to zero. An example of such a pair is 
, which is in quadrant 
.
In quadrant 
, all the 
values are negative and all the 
values are positive, so in quadrant 
, 
and 
cannot be equal. For example, the pair 
does not satisfy the condition, since 
, not 
.
In quadrant 
, the 
values and the 
values are both negative, so it is possible for 
and 
to be equal. For example, the pair 
is in quadrant 
and 
.
In quadrant 
, 
and 
cannot be equal because the 
values are positive and the 
values are negative. For example, the pair 
does not satisfy the condition, since 
.
The quadrants that contain pairs 
that satisfy the given condition are quadrants 
and 
only.
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