lines again

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divya23: Master | Next Rank: 500 Posts; Posts: 113; Joined: Mon Apr 26, 2010 8:58 amFollowed by: 14 members; Thanked: 2 times

by divya23 » Thu Jun 09, 2011 7:53 am

lines n and p line in xy plane is slope of line n< slope of line p
1.lines n and p intersect at (5,1)
2. the intercept y of line n is > than y int of p

both

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Source: Beat The GMAT — Data Sufficiency | Thu Jun 09, 2011 7:53 am

cans: Legendary Member; Posts: 1309; Joined: Mon Apr 04, 2011 5:34 amFollowed by: 123 members; Location: India; Thanked: 310 times; GMAT Score:750

by cans » Thu Jun 09, 2011 7:57 am

let line n be: y=nx+C1
line p be: y=px+c2
to find if n<p
a)(5,1)
5n+c1 = 5p+c2 ----eqn1
insufficient
b)c1>c2
insufficient.
a*b) c1-c2>0 -> 5p-5n>0 ->p>n
Sufficient
IMO C

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Sat Jun 11, 2011 3:25 am

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