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# In the XY plane, does the line with equation y=3x+2 contain

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Intern
Joined: 25 Dec 2008
Posts: 41
In the XY plane, does the line with equation y=3x+2 contain [#permalink]

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01 Jan 2009, 11:54
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In the XY plane, does the line with equation y=3x+2 contain the point (r,s)?

A. (3r+2-s) (4r+9-s)
B. (4r-6-s) (3r+2-s)
Manager
Joined: 24 Sep 2008
Posts: 100
Re: In the XY plane [#permalink]

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01 Jan 2009, 22:21
HUH ??
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Kick GMAT ass

SVP
Joined: 17 Jun 2008
Posts: 1529
Re: In the XY plane [#permalink]

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02 Jan 2009, 03:55
C.

If, line y = 3x+2 contains the point (r,s), then s = 3r + 2.

From stmt1 or stmt2 alone, not sure if 3r + 2 - s = 0.
However, combining two, 3r + 2 - s = 0.
VP
Joined: 05 Jul 2008
Posts: 1401
Re: In the XY plane [#permalink]

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03 Jan 2009, 16:15
scthakur wrote:
C.

If, line y = 3x+2 contains the point (r,s), then s = 3r + 2.

From stmt1 or stmt2 alone, not sure if 3r + 2 - s = 0.
However, combining two, 3r + 2 - s = 0.

I guess the OP missed equals to 0 with both (A) & (B)
Intern
Joined: 30 Sep 2008
Posts: 35
Re: In the XY plane [#permalink]

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04 Jan 2009, 19:25
I think it's C

1. (3r+2-s)(4r+9-s)= 0
a) 3r + 2-s = 0 or 4r+9 -s = 0
s = 3r+2 or 4r +9 = s

2. (4r-6-s)(3r+2-s) = 0
4r -6-s = 0 or 3r+2-s = 0
4r-6 = s or 3r+2 = s

so s = 3r+2
Intern
Joined: 25 Dec 2008
Posts: 41
Re: In the XY plane [#permalink]

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06 Jan 2009, 01:08
OA is : C

Manager
Joined: 02 Aug 2007
Posts: 222
Schools: Life
Re: In the XY plane [#permalink]

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16 Feb 2009, 21:14
scthakur wrote:
From stmt1 or stmt2 alone, not sure if 3r + 2 - s = 0.
However, combining two, 3r + 2 - s = 0.

Can someone explain this part please? I don't get why we can't do:
A. (3r+2-s) =0, (4r+9-s) = 0
B. (4r-6-s) = 0, (3r+2-s) = 0
and solve for r and s in each, which would yield D?
Re: In the XY plane   [#permalink] 16 Feb 2009, 21:14
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# In the XY plane, does the line with equation y=3x+2 contain

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