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04 Jul 2010, 11:40
Kudos
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N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
50% (00:30) correct
50%
(00:24)
wrong
based on 3
sessions
History
Date
Time
Result
Not Attempted Yet
1>
Does k equal j?
1. jk is negative
2. j + k = 0
2>
Are Lines L1 and L2 parallel?.
1. Lines L1 and L2 have different y-intercepts
2. Line R is perpendicular to both L1 and L2
3>
Are Lines L1 and L2 parallel?.
1. Lines L1 and L2 have different y-intercepts
2. Line R is perpendicular to both L1 and L2
Does k equal j?
1. jk is negative
2. j + k = 0
2>
Are Lines L1 and L2 parallel?.
1. Lines L1 and L2 have different y-intercepts
2. Line R is perpendicular to both L1 and L2
3>
Are Lines L1 and L2 parallel?.
1. Lines L1 and L2 have different y-intercepts
2. Line R is perpendicular to both L1 and L2
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
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04 Jul 2010, 13:33
Kudos
Bookmarks
Hi,
Hope my answers will be useful to you.
Answer to Q 1
1 – jk is negative ie one is positive and the second is negative. Hence the answer is sufficient.
2 – j+k=0, thus j = -k. but we have special case when j=-k=0. Hence the answer is not sufficient.
Answer to Q 2
1 For two lines to be parallel they need to have the same slope. Two lines having different y-intercept doesn’t necessarily mean they are parallel. Hence the answer is not sufficient.
2 Two line are perpendicular if the product of their slopes is -1. Both L1 and L2 are perpendicular to R hence both L1 and L2 must have same slope and hence both are parallel and the answer is sufficient.
regards,
Jack
Hope my answers will be useful to you.
Answer to Q 1
1 – jk is negative ie one is positive and the second is negative. Hence the answer is sufficient.
2 – j+k=0, thus j = -k. but we have special case when j=-k=0. Hence the answer is not sufficient.
Answer to Q 2
1 For two lines to be parallel they need to have the same slope. Two lines having different y-intercept doesn’t necessarily mean they are parallel. Hence the answer is not sufficient.
2 Two line are perpendicular if the product of their slopes is -1. Both L1 and L2 are perpendicular to R hence both L1 and L2 must have same slope and hence both are parallel and the answer is sufficient.
regards,
Jack
04 Jul 2010, 13:51
Kudos
Bookmarks
jakolik
+1
Problem 1: A
Problem 2: B
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
