Slope of a Line

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jayanti: Senior | Next Rank: 100 Posts; Posts: 72; Joined: Tue Apr 19, 2011 6:58 amFollowed by: 6 members

by jayanti » Mon Aug 08, 2011 10:57 pm

Lines k and m are parallel to each other. Is the slope of line k positive?

(1) Line k passes through the point (3, 2).
(2) Line m passes through the point (-3, 2).

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Source: Beat The GMAT — Data Sufficiency | Mon Aug 08, 2011 10:57 pm

smackmartine: Legendary Member; Posts: 516; Joined: Fri Jul 31, 2009 3:22 pmFollowed by: 13 members; Thanked: 112 times

by smackmartine » Mon Aug 08, 2011 11:59 pm

IMO E

1) line k can be both +ve or -ve because it can still pass through point(3,2)--> insuff
2) line m can be both +ve or -ve because it can still pass through point(-3,2)--> insuff

Combining st 1 & 2 does n't give any information about the inclination (+\-) of the two lines, which can still be parallel and pass through the given points. -->Insuff

Note: If any other point were given through which line k or m passes, we would know the slope of both the lines.

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abhisays: Senior | Next Rank: 100 Posts; Posts: 54; Joined: Sun Nov 29, 2009 7:11 pm; Location: Bangalore; Thanked: 4 times

by abhisays » Tue Aug 09, 2011 12:06 am

The answer should be E

Just draw the points, x and y axis, you will realize.

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smackmartine: Legendary Member; Posts: 516; Joined: Fri Jul 31, 2009 3:22 pmFollowed by: 13 members; Thanked: 112 times

by smackmartine » Tue Aug 09, 2011 8:06 pm

Whats the OA?

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