co-ordinate geometry.

This topic has expert replies
User avatar
Senior | Next Rank: 100 Posts
Posts: 32
Joined: 16 Jul 2011

co-ordinate geometry.

by Md.Nazrul Islam » Sat Apr 07, 2012 8:46 pm
Is line 1 is parallel to the y-axis ?.

1)the equation of line 1 is x=4 .

2) the points (4,2) and (4,-5) are on the line 1.

User avatar
Junior | Next Rank: 30 Posts
Posts: 15
Joined: 26 Mar 2012
Thanked: 3 times

by gmatmath » Sat Apr 07, 2012 8:57 pm
Yes, line 1 is parellel to the y axis because the equation of a line parallel to the y axis will have the equation x = k, where k is any constant.

In this case we have x = 4.
Attachments
gmat1.xlsx
the graph shows you.
(10.94 KiB) Downloaded 26 times

User avatar
Master | Next Rank: 500 Posts
Posts: 134
Joined: 06 Apr 2012
Thanked: 35 times
Followed by:5 members

by Shalabh's Quants » Sun Apr 08, 2012 5:47 am
Md.Nazrul Islam wrote:Is line 1 is parallel to the y-axis ?.

1)the equation of line 1 is x=4 .

2) the points (4,2) and (4,-5) are on the line 1.
from Stat.1, X=4; Any line with X=Constant will be parallel to Y axis. Sufficient condn.

from Stat.2, X=4 for both the points, hence it will be parallel to Y axis. Sufficient condn.

Ans. D.
Shalabh Jain,
e-GMAT Instructor

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: 02 Apr 2010
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by [email protected] » Sun Apr 08, 2012 5:39 pm
Md.Nazrul Islam wrote:Is line 1 is parallel to the y-axis ?.

1)the equation of line 1 is x=4 .

2) the points (4,2) and (4,-5) are on the line 1.
(1) The equation of line 1 is x = 4 implies line 1 is parallel to y-axis, as x = 4 is a line passing through the point (4, 0), which is parallel to y-axis; SUFFICIENT.

(2) The points (4,2) and (4,-5) are on the line 1 again implies that line 1 is parallel to y-axis; SUFFICIENT.

The correct answer is D.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/

User avatar
Master | Next Rank: 500 Posts
Posts: 287
Joined: 23 Mar 2012
Location: Pune,India
Thanked: 60 times
Followed by:6 members

by GMAT Kolaveri » Sun Apr 08, 2012 5:47 pm
Md.Nazrul Islam wrote:Is line 1 is parallel to the y-axis ?.

1)the equation of line 1 is x=4 .

2) the points (4,2) and (4,-5) are on the line 1.
Line parallel to y axis is of the fornm X=constant. hence D
Regards and Thanks,
[email protected] Kolaveri
https://www.facebook.com/GmatKolaveri
https://gmatkolaveri.tumblr.com/

Click the thank you button if you like my reply :)