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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.
It takes time and effort to explain, so if my comment helped you please press Thanks button :)



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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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