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标题: og 19 382题 [打印本页]

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作者: crystal_10    时间: 2018-9-26 12:20
标题: og 19 382题

【OG19-382题】

Line £ lies in the xy-plane and does not pass through the origin. What is the slope of line £ ?

（1）The x-intercept of line £ is twice the y-intercept of line £.

（2）The x- and y-intercepts of line £ are both positive.

• A
  
  Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  
  
  
• B
  
  Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  
  
  
• C
  
  BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
  
  
  
• D
  
  EACH statement ALONE is sufficient.
  
  
  
• E
  
  Statements (1) and (2) TOGETHER are NOT sufficient.
  
  
  
  

正确答案是a
但是我觉得应该是c，因为截距不是指的绝对值吗？根据条件（1）只能得出k的绝对值等于1/2？

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作者: Melene    时间: 2018-9-26 12:26
选A 截距不能等同于距离 距离一定不为负 但截距可正可负

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作者: cassiopeiazzy    时间: 2018-9-26 13:32
截距可正可负，y=ax+b中，从来没说过b必须>0呀

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