BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Perpendicular lines

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 35
Joined: Wed Oct 29, 2008 5:14 am

Perpendicular lines

by coffee5251 » Tue Dec 23, 2008 10:07 am
In an xy plane line k passes through the point (1,1) and line m passes through the point (1,-1). Are lines k and m perpendicular?

1) Lines k & m intersect at (1,-1)

2) Line k intersects the x-axis at point (1,0)
Top
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 259
Joined: Thu Jan 18, 2007 8:30 pm
Thanked: 16 times

by amitabhprasad » Tue Dec 23, 2008 10:59 am
I am getting "E"
whats OA ?
from stmt 1: we can get slope of 'k' but not for 'm'
in suff.
from stmt 2: again we will know slope of line 'k' but no info for m
in suff.

from 1 and 2 no extra information.
Top
Senior | Next Rank: 100 Posts
Posts: 49
Joined: Tue Nov 11, 2008 8:38 pm
Thanked: 3 times
GMAT Score:740

by Mozartain » Tue Dec 23, 2008 11:00 am
POST DELETED

i misread the question. I read the question was asking whether the two lines are parallel. Here's a big lesson. Read the question, specially the operative terms, very carefully. Because sometimes we get tricked into something different from what the question asks, simply because the unconscious was expecting it that different way.

it was well past midnight and i was solving from my bed on my mobile. That might be a reason though.
Last edited by Mozartain on Tue Dec 23, 2008 6:53 pm, edited 1 time in total.
Top
Master | Next Rank: 500 Posts
Posts: 259
Joined: Thu Jan 18, 2007 8:30 pm
Thanked: 16 times

by amitabhprasad » Tue Dec 23, 2008 11:04 am
Mozartain
how do you get slope for line m ?
Moreover question asked about if the two lines are Perpendicular.
From 2 we know they intersect but not sure at what angle ?
What do you say ?
Top
Legendary Member
Posts: 1153
Joined: Wed Jun 20, 2007 6:21 am
Thanked: 146 times
Followed by:2 members

by parallel_chase » Tue Dec 23, 2008 12:10 pm
I think if we get 1 other point for line m then the we can easily find out if both lines are prepndicular to each other.

Otherwise, answer should be E.

What do you guys think.

OA?
No rest for the Wicked....
Top
Master | Next Rank: 500 Posts
Posts: 259
Joined: Thu Jan 18, 2007 8:30 pm
Thanked: 16 times

by amitabhprasad » Tue Dec 23, 2008 12:14 pm
Yeap I am very much with you
Top
Senior | Next Rank: 100 Posts
Posts: 35
Joined: Wed Oct 29, 2008 5:14 am

by coffee5251 » Tue Dec 23, 2008 6:42 pm
You're right, the OA is E
Top
Senior | Next Rank: 100 Posts
Posts: 49
Joined: Tue Nov 11, 2008 8:38 pm
Thanked: 3 times
GMAT Score:740

by Mozartain » Tue Dec 23, 2008 6:59 pm
amitabhprasad wrote:Mozartain
how do you get slope for line m ?
Moreover question asked about if the two lines are Perpendicular.
From 2 we know they intersect but not sure at what angle ?
What do you say ?
Really sorry. I misread the question. I read 'parallel' in place of 'perpendiculur'. Glad it was not the real test.
Top
User avatar
Legendary Member
Posts: 546
Joined: Sun Nov 16, 2008 11:00 pm
Location: New Delhi , India
Thanked: 13 times

by ronniecoleman » Tue Dec 23, 2008 9:53 pm
IMO E

n an xy plane line k passes through the point (1,1) and line m passes through the point (1,-1). Are lines k and m perpendicular?

1) Lines k & m intersect at (1,-1)

2) Line k intersects the x-axis at point (1,0)


We need to find the second point thru which Line m passes... to find its slope
Admission champion, Hauz khaz
011-27565856
Top
Post new topic Post Reply
• Page 1 of 1