are lines K & M perpendicular

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Megs17: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Fri Apr 22, 2011 9:15 pm

by Megs17 » Sat Oct 29, 2011 12:20 pm

In xy plane, line k passes through (1,1) and m through (1, -1). Are lines k and m perpendicular

a. k and m intersect at (1, -1)
b. k intersects x -axis at (1, 0)

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Source: Beat The GMAT — Data Sufficiency | Sat Oct 29, 2011 12:20 pm

shankar.ashwin: Legendary Member; Posts: 966; Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members; Thanked: 230 times

by shankar.ashwin » Sat Oct 29, 2011 1:03 pm

E IMO.

You already know B from the question, it provides no additional info.

From A, m could be of any orientation intersecting at (1,-1)

Together, Insufficient

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vaibhavgupta: Master | Next Rank: 500 Posts; Posts: 416; Joined: Tue Aug 30, 2011 2:18 pmFollowed by: 9 members; Location: Delhi, India; Thanked: 13 times

by vaibhavgupta » Sat Oct 29, 2011 2:37 pm

Megs17 wrote:In xy plane, line k passes through (1,1) and m through (1, -1). Are lines k and m perpendicular

a. k and m intersect at (1, -1)
b. k intersects x -axis at (1, 0)

IMO C
We can calculate their slopes using the points given. If its perpendicular= -1.

Whts OA?

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