Co-ordinate geom

Expert replies

kris610: Master | Next Rank: 500 Posts; Posts: 198; Joined: Fri Mar 09, 2007 8:40 pm; Thanked: 7 times

by kris610 » Sun Aug 02, 2009 4:02 pm

Lines A and B intersect at (16/5,12/5). What is the slope of line B?

A) One of the angles formed at the pt of intersection is 90 deg.

B) Line A passes through the origin.

Like this post

Source: Beat The GMAT — Data Sufficiency | Sun Aug 02, 2009 4:02 pm

shahdevine: Master | Next Rank: 500 Posts; Posts: 197; Joined: Sun May 18, 2008 2:47 am; Thanked: 12 times

by shahdevine » Sun Aug 02, 2009 6:11 pm

this is prolly e.

given: point on coordinate graph where lines a and b intersect. (16/5,12/5)
need: slope or m of line b

y=mx+b
16/5=m(12/5)+b

statement 1)

tells me angles formed are right angles but no m. insufficient

statement 2)

tells me line a passes through origin. I could get slope of line a with this info, but not line b.

combined.

still nothing. i don't have y-intercept for line b.

E

plz confirm.

Like this post

kris610: Master | Next Rank: 500 Posts; Posts: 198; Joined: Fri Mar 09, 2007 8:40 pm; Thanked: 7 times

by kris610 » Sun Aug 02, 2009 6:41 pm

Shah,
No, you need to take a closer look.

Like this post

adityanarula: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Thu May 21, 2009 8:52 am; Thanked: 3 times

by adityanarula » Sun Aug 02, 2009 8:02 pm

IMO C

Stmnt 1: tells us that the product of the slopes is -1
Stmnt 2: we can determine slope of line A

Both together will be sufficient

Like this post

kris610: Master | Next Rank: 500 Posts; Posts: 198; Joined: Fri Mar 09, 2007 8:40 pm; Thanked: 7 times

by kris610 » Mon Aug 03, 2009 3:01 am

OA is C.

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review