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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Fri Mar 20, 2009 3:15 am

Are lines p (with slope m) and q (with slope n) perpendicular to each other?
1. m + 2 = n
2. m + n = 0

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Source: Beat The GMAT — Data Sufficiency | Fri Mar 20, 2009 3:15 am

Tryingmybest: Master | Next Rank: 500 Posts; Posts: 168; Joined: Thu Nov 13, 2008 4:34 am; Location: Pittsburgh; Thanked: 9 times

by Tryingmybest » Fri Mar 20, 2009 7:13 am

This was discussed 2 days back
https://www.beatthegmat.com/slope-t33092.html

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