斜率

LeannaChina · 发表于 2011-3-16 17:40:07

Q24:
In the xy-plane, line n passes through the origin and has slope 4.If points (1, c) and (d, 2) are on line n, what is the value of
?

A.0.25
B.0.5
C.2
D.4
E.8
Answer:
24题我算的是B 可是答案是E。。。恩。。怎么办呢谢谢啦~~

crazyst · 发表于 2011-3-16 17:46:41

of what?

LeannaChina · 发表于 2011-3-16 18:36:27

ivyyoung · 发表于 2011-3-22 19:24:51

k=(y1-y2)/(x1-x2)=4，再直接把三个坐标（0,0）,(1, c) and (d, 2)往里边带就可以了。
4=（2-0）/(d-0)得：d=1/2.
4=(c-0)/(1-0)得：c=4
所以c/d=4*2=8

斜率

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