88. On XY plane. If a line goes through Point A (A, 5), A is not equal to 5,is the slope of the line<0?
a. Line goes through (0, -2)
b. Line goes through (5, A)
I chose B,maybe it\\\\\\\'s wrong. I don\\\\\\\'t understand why people think it\\\\\\\'s D, what does the first condition tell you if you don\\\\\\\'t know what the value of A is?
【讨论】my answer is E,it is correct. if A=5, B can\\\\\\\'t determine the slope, but 1) can determine, the slope = 7/5>0;If A<>5, the slope =5-A/A-5=-1<0,==>E;
Attention, If 1) (0,6),the slope =-1/5<0 the answer will be C.
说了这么多，没弄明白，请教啊!
现在题中已经说了A<>5了，B可不可以啊!作者: qqks 时间: 2002-12-26 01:54
我认为是b，可以推出k=-1作者: happygmat 时间: 2002-12-26 10:56
I think it's B, right?作者: 1stzhang 时间: 2002-12-29 10:51
must b!!!!!
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