[計量] 請問兩題計量
看板GRE (GRE入學考試)作者ringo543 (雷龍出國了~~帳號代管中)時間16年前 (2009/10/26 23:03)推噓2(2推 0噓 1→)留言3則, 2人參與討論串3/6 (看更多)
1) For the line with equation y=ax+b, ab <> 0( not equal to zero)
the x -intercept is twice the y-intercept
A: slope of the line
B: 1/2
2)Graph of equation y= ax+b , ab<>0
has equal x-and y-intercept.
A: slope of graph
B: -1
這兩題應該答案都是D 無法比較吧
因為雖然知道intercept的比例，但仍無法判定slop會是正是負
為想問這題是因為碰巧看到了國外論壇的解題
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Soln1> The slope of the given line can be positive or negative.
i.e 1/2 or -1/2. ( I hope you know how to calculate slope)
[Hence soln should be D.]
But if you go by equations
i.e by substituting x=0 and y=0 seperately.
I got -1/2
so soln should be B
Soln2> Similar argument it can be positive or negative
i.e 1 or -1
[Hence solution should be D.]
But again While solving we get slope as -1
so soln is C
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都不是D........
怎麼會這樣 冏
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