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

Redeem

111 parabola intersection

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 226
Joined: Sun Aug 09, 2009 4:34 am

111 parabola intersection

by ern5231 » Mon Oct 05, 2009 4:19 pm
Q1 y = x ^ 2, px + qy +1 = 0, are two equations in the XY axis. Is there a point of intersection?
a. p ^ 2 = 4q
b. q ^ 2 = 4p


Q2 Parabola y = x ^ 2, and qx + py +1 = 0, Is there a point of intersection?
(1) p = q ^ 2 / 4 (2) q = 4p ^ 2

OA later
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 727
Joined: Sun Jun 08, 2008 9:32 pm
Thanked: 8 times
Followed by:1 members

Re: 111 parabola intersection

by umaa » Mon Oct 05, 2009 5:55 pm
ern5231 wrote:Q1 y = x ^ 2, px + qy +1 = 0, are two equations in the XY axis. Is there a point of intersection?
a. p ^ 2 = 4q
b. q ^ 2 = 4p


Q2 Parabola y = x ^ 2, and qx + py +1 = 0, Is there a point of intersection?
(1) p = q ^ 2 / 4 (2) q = 4p ^ 2

OA later
IMO C for both the question.

First question can be plotted by using both the equation. There is no intersection point.

But in the second q, the p value is sqrrot(4).

If we know the values of p and q, we can definitely find whether both the graphs intersect. So, I assume the answer is C for the second question.

Source of the question and OA pls.
What we think, we become
Top
Master | Next Rank: 500 Posts
Posts: 377
Joined: Wed Sep 03, 2008 9:30 am
Thanked: 15 times
Followed by:2 members

Re: 111 parabola intersection

by schumi_gmat » Mon Oct 05, 2009 7:22 pm
ern5231 wrote:Q1 y = x ^ 2, px + qy +1 = 0, are two equations in the XY axis. Is there a point of intersection?
a. p ^ 2 = 4q
b. q ^ 2 = 4p


Q2 Parabola y = x ^ 2, and qx + py +1 = 0, Is there a point of intersection?
(1) p = q ^ 2 / 4 (2) q = 4p ^ 2

OA later
IMO E

p and Q are not defined as constants. So We can have multiple values of p and q

hence E
Top
Master | Next Rank: 500 Posts
Posts: 226
Joined: Sun Aug 09, 2009 4:34 am

by ern5231 » Fri Oct 09, 2009 12:11 am
OA for 1st one is C and second one is A. Can anyone explain?
Top
Senior | Next Rank: 100 Posts
Posts: 49
Joined: Tue May 19, 2009 10:48 am
Location: Chicago
Thanked: 1 times
GMAT Score:680

by Katrusya » Fri Oct 09, 2009 1:10 pm
I got A for both of them.
OA is strange.
Top
Legendary Member
Posts: 727
Joined: Sun Jun 08, 2008 9:32 pm
Thanked: 8 times
Followed by:1 members

by umaa » Fri Oct 09, 2009 8:06 pm
IMO A can't be the answer for the second question. If Statement 1 is sufficint, statement 2 should be sufficient.

Let me know what is the source of the question..
What we think, we become
Top
Master | Next Rank: 500 Posts
Posts: 226
Joined: Sun Aug 09, 2009 4:34 am

by ern5231 » Tue Oct 13, 2009 12:37 am
Guys this is a question from Gmat mock test at my prep center. It is a real toughie. I am not understanding anything from your solutions. Hope an instructor can help!
Top
Post new topic Post Reply
• Page 1 of 1