2012年04月03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, the slope of the line through points
. What is the value of 
?
A.
B.
C.
D.
E.
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正确答案:B 解析: The slope of a line in a coordinate plane is given by the fraction whose numerator is the change in The question asks for the value of The change in
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between any two points on the line and whose denominator is the change in 
between the same points on the line.
, which is the 
-coordinate of point 
.
between points 
and 
is 
. The change in 
between these points is 
. Since the slope is 
, it follows that 
. Solving this equation gives 
. Therefore, 
, and 
.