Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Jun 1006:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..- Jun 10
10:00 AM PDT
-11:00 AM PDT
Scoring 715 on the GMAT Focus Edition requires more than just learning formulas, memorizing concepts, or solving hundreds of questions. In this episode, Nishant shares how he improved his GMAT preparation by focusing on application of concepts, and more. 
Jun 1111:00 AM EDT
-01:00 PM EDT
TTP GMAT OnDemand gives serious students 400+ hours of expert video instruction, the full TTP course, AI support, weekly office hours, and a 715+ score guarantee—all built for elite GMAT score improvement.
Jun 2207:30 PM EDT
-09:30 PM EDT
Master the GMAT with expert live instruction, a personalized study plan, and real-time support. Includes 40 hours of online classes plus 6 months of access to the TTP GMAT OnDemand video course. Class date: Mon/Wed June 22, 2026 →August 26, 2026
12 Aug 2009, 18:06
Kudos
Bookmarks
The question says if (1) y = kx + b is parallel to (2) x = b + ky, what is true about k?
The answer explains that equation (2) can be rearranged to from y = x/k - b/k.
For the lines to be parallel, the slopes must be equal, so k = 1/k, k*k = 1, and k = +1 or -1.
HOWEVER, I understand that two parallel lines must not share any points, i.e. not be coincident. Thus b must NOT equal -b/k; hence k must NOT equal -1.
Thus for the lines to be parallel (same slope and yet distinct lines) k = +1 only. The answer should be B { k=1 }, and not D { |k|-1=0 }.
I am going by the definition that parallel lines never meet. Is this correct for the GMAT?
The answer explains that equation (2) can be rearranged to from y = x/k - b/k.
For the lines to be parallel, the slopes must be equal, so k = 1/k, k*k = 1, and k = +1 or -1.
HOWEVER, I understand that two parallel lines must not share any points, i.e. not be coincident. Thus b must NOT equal -b/k; hence k must NOT equal -1.
Thus for the lines to be parallel (same slope and yet distinct lines) k = +1 only. The answer should be B { k=1 }, and not D { |k|-1=0 }.
I am going by the definition that parallel lines never meet. Is this correct for the GMAT?
Archived Topic
Hi there,
Archived GMAT Club Tests question - no more replies possible.
Where to now? Try our up-to-date Free Adaptive GMAT Club Tests
for the latest questions.
Still interested? Check out the "Best Topics" block below for better discussion and related questions.
Thank you for understanding, and happy exploring!
12 Aug 2009, 18:58
Kudos
Bookmarks
Lines are possible for K= 1 or -1
If K = -1 then lines will be parallel and colinear.
If k = 1 then the lines will be just parallel
If K = -1 then lines will be parallel and colinear.
If k = 1 then the lines will be just parallel
