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08 Oct 2022, 13:25
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BrentGMATPrepNow
Thanks BrentGMATPrepNow for your quick reply and clarifiction. How about if x=1 and y=-1, then combined 1 & 2 and we get 1-(-1)+1 > 1-1-1 > 3>-1. Therefore shouldn't it be C? Somehow I couldn't make sense in number testing in this case though I can understand in alegbra way. Could you help? Thanks
08 Oct 2022, 16:46
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Kimberly77
-----------ORIGINAL QUESTION----------------
Is x-y+1 greater than x+y-1 ?
(1) x > 0
(2) y < 0
---------------------------------------------------
If you feel that the answer is C, you must first show that statement 2 is not sufficient.
To do this, you must provide two pairs of values (for x and y) that satisfy statement 2 AND yield different answers to the target question ("Is x-y+1 greater than x+y-1 ?")
So, you need one pair of x- and y-values such that x-y+1 IS greater than x+y-1,
...and you need one pair of x- and y-values such that x-y+1 IS NOT greater than x+y-1,
When we use your pair of values (x=1 and y=-1), the answer to the target question is YES, x-y+1 is greater than x+y-1.
To show that statement 2 is not sufficient, you must find another pair of values so that the answer to the target question is NO, x-y+1 is NOT greater than x+y-1.
So, see if you can find such numbers (Note: the numbers must be such that y is negative).
09 Oct 2022, 14:38
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Thanks BrentGMATPrepNow for your quick reply and explanation. My understanding is that statement 2 is not sufficient as only y is given and we don't know what x is. Is this way of reasoning is correct too? Thanks for your time in advanced.
