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本題由lindy提供
The y-intercept of a line L is 4. If
I -1
II 0
III 6
(A) I only
(B) II only
(C) III only
(D) I and II
(E) I and III
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答案：
C
解這題必須
知道這是啥意思：
Y-intercept:X = 0 時,直線或曲線的相應 Y 坐標值.
X-intercept:Y = 0 時,直線或曲線的相應 X 坐標值.
所以根據(jù)我們常用的直線線段y=kx+b 這里的b就應該等于4；k應該是小于0 的，因為斜率為負嘛
這里推出來就應該是-4=kx 因為k小于0 那么x就應該大于0才能滿足條件
現(xiàn)在算讓y等于0的是時候，x的值 推出來x應該是大于0的
所以只有C 
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