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Value x^2+y^2?

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Source: — Data Sufficiency |
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by pemdas » Fri May 20, 2011 7:42 pm
st(1) can be further simplified as (x-y)^2=1 <> x-y=|1|, Not Sufficient;
st(2) ditto here (x+y)^2=4 <> x+y=|2|, Not Sufficient;

combined st(1&2): since we have mods there is more than one value for x when st(1) is added to st(2).
IOM e
RWO wrote:What is the value of x^2 + y^2 ?
(1) x^2 + y^2 = 2xy + 1
(2) x^2 + y^2 = 4 - 2xy



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by cans » Mon Jun 06, 2011 9:38 pm
What is the value of x^2 + y^2 ?
(1) x^2 + y^2 = 2xy + 1
(2) x^2 + y^2 = 4 - 2xy
a)insufficient. (1 equation, 2 variables)
b)insufficient. (1 equation, 2 variables)
a & b together) xy=3/4 thus x^2 + y^2 = 1+3/2 = 5/2
Sufficient.
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by garima99 » Tue Jun 07, 2011 10:26 pm
Add the two equations
2(x^2 + y^2)=5
IMO C
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by kruthika » Wed Jun 08, 2011 12:20 am
The two statements together will give a solution.
IMO c
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