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

Redeem

Point (R,S)

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 66
Joined: Mon Jun 14, 2010 4:46 am
Thanked: 3 times

Point (R,S)

by JeetGulia » Sun Sep 12, 2010 5:35 am
In the xy-plane, does the line with equation Y=3X+2, contain the point (r,s)?

a) (3r+2-s)(4r+9-s)=0
b) (4r-6-s)(3r+2-s)=0

And C...why not D?
Last edited by JeetGulia on Sun Sep 12, 2010 6:56 am, edited 1 time in total.
Top
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1893
Joined: Sun May 30, 2010 11:48 pm
Thanked: 215 times
Followed by:7 members

by kvcpk » Sun Sep 12, 2010 6:36 am
once again incomplete question.
Please check before posting.
"Once you start working on something,
don't be afraid of failure and don't abandon it.
People who work sincerely are the happiest."
Chanakya quotes (Indian politician, strategist and writer, 350 BC-275BC)
Top
User avatar
GMAT Instructor
Posts: 641
Joined: Wed Jul 22, 2009 3:07 pm
Location: Madison, WI
Thanked: 162 times
Followed by:45 members
GMAT Score:760

by Jim@Grockit » Sun Sep 12, 2010 7:55 pm
JeetGulia wrote:In the xy-plane, does the line with equation Y=3X+2, contain the point (r,s)?

a) (3r+2-s)(4r+9-s)=0
b) (4r-6-s)(3r+2-s)=0

And C...why not D?
If (3r+2-s) = 0, then you know that s = 3r + 2, exactly the equation we're looking for. One statement on its own is not enough to confirm that the (3r+2-s) part of the equation is the part equal to zero; either expression could = 0. Look at it another way:

If a and c are not equal, does b = 0?
1) bc = 0
2) ab= 0

Each statement on its own is not enough to single out b = 0, but together they are sufficient. In this alternate example, b = (3r + 2 -s).

Make sense?
Top
Post new topic Post Reply
• Page 1 of 1