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# Do lines y=ax^2+b and y=cx^2+d cross? 1.a=-c 2 b>d. is A

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Current Student
Joined: 11 May 2008
Posts: 552
Do lines y=ax^2+b and y=cx^2+d cross? 1.a=-c 2 b>d. is A [#permalink]

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08 Sep 2008, 23:42
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Do lines y=ax^2+b and y=cx^2+d cross?
1.a=-c
2 b>d.

is A not suff. since we get to know that the slopes are not same. and when slopes of two lines are not same, they have to intesect somewhere ...
Senior Manager
Joined: 16 Jul 2008
Posts: 285
Schools: INSEAD Dec'10
Re: lines Xn [#permalink]

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08 Sep 2008, 23:50
I think we've had this problem before. Basically, these are not lines, but parablolas. A is not sufficient, becase it tells us that the parabolas are facing in opposite directions (up and down), but nothing else.

Edit: and the answer is E.
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Current Student
Joined: 11 May 2008
Posts: 552
Re: lines Xn [#permalink]

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09 Sep 2008, 08:17
well, i felt it suspicious to have x^2 in a line...
but its still posted on the gmat club site..
so donno

lets say it was just x instead of the x^2 ...then??
SVP
Joined: 07 Nov 2007
Posts: 1765
Location: New York
Re: lines Xn [#permalink]

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09 Sep 2008, 08:28
arjtryarjtry wrote:
well, i felt it suspicious to have x^2 in a line...
but its still posted on the gmat club site..
so donno

lets say it was just x instead of the x^2 ...then??

http://gmatclub.com/forum/7-p514376

This question has been discussed before..
you know what !!! you only posted..
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Current Student
Joined: 11 May 2008
Posts: 552
Re: lines Xn [#permalink]

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09 Sep 2008, 10:28
oops!!!
sorry galthi se mistake ho gaya!!!
anyways for those who missed it that time ..now they can have a look..
Re: lines Xn   [#permalink] 09 Sep 2008, 10:28
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# Do lines y=ax^2+b and y=cx^2+d cross? 1.a=-c 2 b>d. is A

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