GMATPrep equation problem

netigen · Posted: Mon May 12, 2008 1:15 am Post subject: GMATPrep equation problem

Help me get this one right.

I thought we can solve for XY using both the equations if we subtract one equation from another we get

x^2 = x or x=1 and hence, y=2

OA is E

amitansu · Posted: Mon May 12, 2008 1:19 am Post subject:

Netigen, you are right.
Ans should be C.

Amit

akshatsingh · Posted: Mon May 12, 2008 9:03 pm Post subject:

x^2 = x doesnt mean x = 1.

it means x(x-1) = 0
=> x=0 or x=1

Clearly a unique xy cannot be found out using these values of x.

I believe answer should be E.

netigen · Posted: Mon May 12, 2008 9:39 pm Post subject:

I knew I was doing something stupid 8), thanks for pointing it out.

gabriel · Posted: Tue May 13, 2008 11:28 am Post subject: