DS Plz. help

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gmattester: Master | Next Rank: 500 Posts; Posts: 172; Joined: Wed Oct 31, 2007 11:21 am; Thanked: 1 times

by gmattester » Thu Aug 28, 2008 12:29 pm

In the xy –plane, is point (2, – 3) on line ℓ ?
(1) Point (– 2, 3) is on line ℓ.
(2) ℓ is not perpendicular to the x – axis.

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Source: Beat The GMAT — Data Sufficiency | Thu Aug 28, 2008 12:29 pm

sethids: Master | Next Rank: 500 Posts; Posts: 135; Joined: Mon Jun 23, 2008 3:56 am; Thanked: 7 times

by sethids » Thu Aug 28, 2008 1:24 pm

Stmt1: (-2,3) is on line l.
There is an equal possiblity of (2,-3) being on the line or off the line. Insufficient. Left wth B, C and E.

Stmt2: Line l is not perpendicular to x axis. i.e. it intersects the x axis. But at what point we dont know. Again nothing can be said about the point's existence on the line. left with C and E

Combining both, no conclusive evidence of (2,-3) being on or off the line.
Hence E.

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