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Equations

by El Cucu » Thu Jan 01, 2009 12:46 pm
Is x=y?

1) (x-y)= (x^2-y^2)

2) X and Y are each greater than 1.

Anyone has a kind of approach to this problems? Tks. in advance.
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Source: — Data Sufficiency |
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Re: Equations

by logitech » Thu Jan 01, 2009 4:18 pm
Is x=y?

1) (x-y)= (x^2-y^2)

(x-y) = (x-y)(x+y)

(x-y) - (x-y)(x+y) = 0

(x-y) [ 1 - (x+y) ] =0

x=y OR x+y = 1

2) X and Y are each greater than 1.

X>1
y>1

x+y> 2

INSUF

1 + 2 )

Since x+y can not be 1

It is X=Y

IMO, C
LGTCH
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