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本題由lindy提供
All points (x, y) that lie below
(A) y < 2x + 3
(B) y < -2x + 3
(C) y < -x + 3
(D) y < (1/2)x+3
(E) y < (-1/2)x+3
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答案：
E
點（x,y）屬
于L這條線下面，那么x y滿足哪個不等式？
先把Line L的關系式求出來：
兩點：y=kx+b b=3 k=-1/2
所以y=-1/2x+3
既然那點都在線下面
那就是y<-1/2x+3 
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