• NEW! FREE Beat The GMAT Quizzes
Hundreds of Questions Highly Detailed Reporting Expert Explanations
• 7 CATs FREE!
If you earn 100 Forum Points

Engage in the Beat The GMAT forums to earn
100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## OG-12.94 ##### This topic has 2 member replies ## OG-12.94 If Line K in th xy-plane has equation y=mx+b, where m and b are constants, what is the slope of k? 1) K is parallel to the line with equation y = (1-m)x + b + 1 2) K intersects the line with equation y=2x+3 at the point (2,7)) OA A. Though I understood why B is insufficient, will option B be sufficient if the question is reworded that K and y=2x+3 are perpendicular (and hence we know from K's slope the relation m1*m2=-1). Also, which other additional/new info will make B sufficient. Thx Senior | Next Rank: 100 Posts Joined 29 Nov 2009 Posted: 54 messages Upvotes: 4 Test Date: Not Decided Target GMAT Score: 750 GMAT Score: N.A From 1 we have m = 1-m hence m = 1/2 So 1 is sufficient. From 2 we have mx+b = 2x+3 i.e 2m +b = 7, we have only this equation, so 2 is not sufficient. Hence Answer should be A Senior | Next Rank: 100 Posts Joined 22 Jan 2010 Posted: 90 messages Followed by: 4 members Upvotes: 13 Target GMAT Score: 700+ GMAT Score: 640 Quote: if the question is reworded that K and y=2x+3 are perpendicular (and hence we know from K's slope the relation m1*m2=-1). Also, which other additional/new info will make B sufficient. you are right, had it been given that the line is perpendicular to y=2x+3, then even statement 2 would have been sufficient. Statement 2 would also have been sufficient if one point on line K was also given. _________________ Stay focused • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

• Award-winning private GMAT tutoring
Register now and save up to \$200

Available with Beat the GMAT members only code

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

### Top First Responders*

1 Ian Stewart 44 first replies
2 Brent@GMATPrepNow 33 first replies
3 Scott@TargetTestPrep 32 first replies
4 Jay@ManhattanReview 24 first replies
5 GMATGuruNY 18 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

### Most Active Experts

1 Scott@TargetTestPrep

Target Test Prep

149 posts
2 Max@Math Revolution

Math Revolution

93 posts
3 Ian Stewart

GMATiX Teacher

53 posts
4 Brent@GMATPrepNow

GMAT Prep Now Teacher

50 posts
5 GMATGuruNY

The Princeton Review Teacher

30 posts
See More Top Beat The GMAT Experts