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Source: — Data Sufficiency |
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by harsh.champ » Sun Feb 21, 2010 10:24 am
gmatwriter wrote:In the xy-plane, is the point (4, -2) on the line L?

1. Point (1,1) in on line L.
2. The equation x=2-y describes line L.

B
IMP Pt.:-
For unique eqn to a line we need:-
1)a pt. on the line -(1,1) but slope not given in the 1st statement
2)slope of the line.
Both are listed in statement 2.
Hence B.
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by ajith » Sun Feb 21, 2010 10:27 am
gmatwriter wrote:In the xy-plane, is the point (4, -2) on the line L?

1. Point (1,1) in on line L.
2. The equation x=2-y describes line L.

B

1. insufficient

2) One can substitute (4, -2) in the equation x=2-y and see if it falls in the line

Sufficient

Hence B[/spoiler]
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by shashank.ism » Sun Feb 21, 2010 12:00 pm
gmatwriter wrote:In the xy-plane, is the point (4, -2) on the line L?

1. Point (1,1) in on line L.
2. The equation x=2-y describes line L.

B
to check whether point (4, -2) lies on the line L..
St.1) since we know one point(1,1) and nothing else i.e. slope or any other point on line we can't detrmine it..=====not suff.
St.2) The equation x=2-y describes line L. so putting values (4,-2) -2 = 2-4 which is true ....suff
Ans B
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by gmatwriter » Mon Feb 22, 2010 10:52 am
Thanks all :)
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