inequality

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Deepthi Subbu: Master | Next Rank: 500 Posts; Posts: 298; Joined: Tue Feb 16, 2010 1:09 amFollowed by: 1 member; Thanked: 2 times

by Deepthi Subbu » Sat Jul 02, 2011 4:26 am

1.Is 1/x-y < y-x ?

(1) y is positive.
(2) x is negative.

2. Is xy > 9 ?
(1) x <= 4 and y >= 2
(2) x >= 2 and y <= 4

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Source: Beat The GMAT — Data Sufficiency | Sat Jul 02, 2011 4:26 am

r2kins: Senior | Next Rank: 100 Posts; Posts: 58; Joined: Sat Apr 17, 2010 7:30 am; Thanked: 2 times

by r2kins » Sat Jul 02, 2011 4:43 am

1. C?

2. E?

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Deepthi Subbu: Master | Next Rank: 500 Posts; Posts: 298; Joined: Tue Feb 16, 2010 1:09 amFollowed by: 1 member; Thanked: 2 times

by Deepthi Subbu » Sat Jul 02, 2011 4:51 am

r2kins - you are right .

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r2kins: Senior | Next Rank: 100 Posts; Posts: 58; Joined: Sat Apr 17, 2010 7:30 am; Thanked: 2 times

by r2kins » Sat Jul 02, 2011 5:01 am

Deepthi Subbu wrote:r2kins - you are right .

Thanks.

Q1- I just plugged in values for x and y (both +ve and -ve) and found that the answer differed depending on the sign, "+" or "-" of the values. However, if we take x as +ve and y -ve, the answer to the inequality is "NO" in both the cases, hence sufficient!

was wondering if there is there a shorter way to solve this though?

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