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# Is rs = rx -2? (1) r is an odd number (2) x = s +2 Pls

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Is rs = rx -2? (1) r is an odd number (2) x = s +2 Pls [#permalink]  31 Oct 2008, 08:17
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Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

Thanks
Current Student
Joined: 28 Dec 2004
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Location: New York City
Schools: Wharton'11 HBS'12
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Re: DS - is rs = rx-2? [#permalink]  31 Oct 2008, 08:36
nganle08 wrote:
Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

Thanks

r=-2/(s-x) which means if r is odd only possibility is s-x=-2 or 2 or -2/3 or 2/3 etc, which implies r=1 or -1

rs+2=rx, so if r is odd..we dont know the value of x or s..so 1) is insuff

2) x=s+2; rs=r(s+2)-2 rs-rs=2r-2 or 2r-2=0 which is only true if r=1...

we dont know anything about r..

1+2 together we know that r=odd, i.e 1..or 3 or 5 we dont know

E it is
Manager
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Re: DS - is rs = rx-2? [#permalink]  31 Oct 2008, 09:49
fresinha12 wrote:
nganle08 wrote:
Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

Thanks

r=-2/(s-x) which means if r is odd only possibility is s-x=-2 or 2 or -2/3 or 2/3 etc, which implies r=1 or -1

rs+2=rx, so if r is odd..we dont know the value of x or s..so 1) is insuff

2) x=s+2; rs=r(s+2)-2 rs-rs=2r-2 or 2r-2=0 which is only true if r=1...

we dont know anything about r..

1+2 together we know that r=odd, i.e 1..or 3 or 5 we dont know

E it is

Thanks. I do not have the OA for this but I seem to agree with E and agree with your explanation. Does anyone have different opinion?
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Re: DS - is rs = rx-2? [#permalink]  31 Oct 2008, 10:28
[quote="nganle08"]Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

is r(s-x) = -2

from one insuff

from 2

is r(s-s-2) = -2r ie: is r = 1

insuff

both

insuff
too

E
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Re: DS - is rs = rx-2? [#permalink]  31 Oct 2008, 14:16
rs = rx -2 ?
rx - rs = 2 ?
r (x - s) = 2 ?

1: r is an odd number. nsf..

2: x = s + 2
x - s = 2
nsf.

togather: only possible if r = 1 (or -1 as well, i guess).
E.

yezz wrote:
nganle08 wrote:
Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

is r(s-x) = -2

from one insuff
from 2: is r(s-s-2) = -2r ie: is r = 1
insuff

both: insuff too

E

How did you get r = 1?

We do not know whether rs = rx - 2? This is waht we have to proove.
_________________
Re: DS - is rs = rx-2?   [#permalink] 31 Oct 2008, 14:16
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