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Coordinate geometry

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Coordinate geometry

by umaa » Tue Jul 21, 2009 6:54 pm
In the xy-plane, point P has coordinates (m; n) and point Q
has coordinates (n;m). What is the distance between
P and Q?
(1) m - n = 2 � n = 2
(2) m + n = 5

I don't have the original answer for this. IMO A.

Let me know your answers and explanations.
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by tohellandback » Tue Jul 21, 2009 7:01 pm
IMO A

distance is sqrt((m-n)^2+(n-m)^2)

1) sufficient to find m-n and n-m
2) Not SUFF
The powers of two are bloody impolite!!
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Re: Coordinate geometry

by real2008 » Wed Jul 22, 2009 12:54 am
umaa wrote:In the xy-plane, point P has coordinates (m; n) and point Q
has coordinates (n;m). What is the distance between
P and Q?
(1) m - n = 2 � n = 2
(2) m + n = 5

I don't have the original answer for this. IMO A.

Let me know your answers and explanations.
i think answer should be A; here the information that n= 2 is not needed even.
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