Section 6, question 25 1000 DS

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isisalaska: Community Manager; Posts: 363; Joined: Sun Dec 10, 2006 12:24 pmFollowed by: 3 members; Location: St. Louis; Thanked: 7 times

by isisalaska » Sun Jan 21, 2007 4:31 pm

Source: 1000 DS, section 6
25. If x ≠ 1, is y equal to x + 1?
(1)
(2) y2 = (x + 1)2

Why is not D?

Isis Alaska

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Source: Beat The GMAT — Data Sufficiency | Sun Jan 21, 2007 4:31 pm

axefx: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Fri Dec 01, 2006 12:05 pm; Location: PA, USA

Re: Section 6, question 25 1000 DS

by axefx » Wed Jan 24, 2007 11:10 am

isisalaska wrote:Source: 1000 DS, section 6
25. If x ≠ 1, is y equal to x + 1?
(1)
(2) y2 = (x + 1)2

Why is not D?

Your post is missing the first condition... please repost.

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pankajks2010: Master | Next Rank: 500 Posts; Posts: 118; Joined: Wed Mar 16, 2011 12:51 amFollowed by: 1 member; Location: New Delhi, India; Thanked: 12 times

by pankajks2010 » Sat May 14, 2011 12:13 pm

evaluating just the second statement: Its insufficient, as (-3)^2=3^2 ; However, -3 is not equal to 3. similarly, every negative & positive pair of a number would satisfy this.

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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 » Fri May 27, 2011 8:01 am

y2 = (x + 1)2
=> y=+(x+1) or y=-(x+1)
Hence insufficient

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