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# If x > 0, and y> 0, which of the following is

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Eternal Intern
Joined: 07 Jun 2003
Posts: 470
Location: Lone Star State
Followers: 1

Kudos [?]: 44 [0], given: 0

If x > 0, and y> 0, which of the following is [#permalink]  22 Jul 2003, 08:47
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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If x > 0, and y> 0, which of the following is equivalent to x/y sqrt y/ sqrt x ^2.

1) 1
2) sq rt x / sq rt y
3) sq rt x
4) 1 / sq rt x

5) 1/ sq rt y

Please explain, I plug in numbers and it got me the wrong answer.
Manager
Joined: 22 Jul 2003
Posts: 63
Location: CA
Followers: 1

Kudos [?]: 0 [0], given: 0

If x > 0, and y> 0, which of the following is equivalent to x/y sqrt y/ sqrt x ^2.
1) 1
2) sq rt x / sq rt y
3) sq rt x
4) 1 / sq rt x
5) 1/ sq rt y

The right choice is (5) 1/sqrt y because
x/y sqrt y/sqrt x^2
= x/y sqrt y/x
= sqrt y / y
= 1 / sqrt y [because y = (sqrt y ^ 2)]
_________________

P K Das

Eternal Intern
Joined: 07 Jun 2003
Posts: 470
Location: Lone Star State
Followers: 1

Kudos [?]: 44 [0], given: 0

Hi Welcome on Board,

I think this way is better sq rt y = y ^ 1/2
--------= y - ^ 1/2= 1/ sq rt y.
y
SVP
Joined: 03 Feb 2003
Posts: 1608
Followers: 6

Kudos [?]: 76 [0], given: 0

in order for other people to understand your question, it should be written as (x/y)*(sqrt y/sqrt x^2).
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