Are x and y both positive ?
1) 2x - 2y = 0
2) x/y > 1
Can someone explain me with calculation how to find this ?
Thank you
are they Positive ??
This topic has expert replies
-
- Legendary Member
- Posts: 752
- Joined: Sun May 17, 2009 11:04 pm
- Location: Tokyo
- Thanked: 81 times
- GMAT Score:680
IMO E
1)2x - 2y = 1
or x=1/2 + Y now x and y can be +ve or -ve. take examples y=-5 and y=10
INSUFF
2) it just tells you that x>y both can be positive. x=20, y=10
or both can be negative- x=-20,y=-10
INSUFF
combining
x>y
and
x=1/2 + Y- in this eq positive or negative X is always greater than Y
1)2x - 2y = 1
or x=1/2 + Y now x and y can be +ve or -ve. take examples y=-5 and y=10
INSUFF
2) it just tells you that x>y both can be positive. x=20, y=10
or both can be negative- x=-20,y=-10
INSUFF
combining
x>y
and
x=1/2 + Y- in this eq positive or negative X is always greater than Y
The powers of two are bloody impolite!!
-
- Legendary Member
- Posts: 752
- Joined: Sun May 17, 2009 11:04 pm
- Location: Tokyo
- Thanked: 81 times
- GMAT Score:680
oops sorry I got it..Khaim wrote:I also answered E ...
But the correct answer is C !! I dont know why
the question is from the GMATprep software exam 1
It has to be C. I did a mistake
1)2x - 2y = 1
or x=1/2 + Y now x and y can be +ve or -ve. take examples y=-5 and y=10
INSUFF
2) x>y when both are positive
x<y when both are negative
combining
x=1/2 + Y- in this eq positive or negative X is always greater than Y
so from 2 x>y i.e. both are positive
The powers of two are bloody impolite!!
-
- Legendary Member
- Posts: 1161
- Joined: Mon May 12, 2008 2:52 am
- Location: Sydney
- Thanked: 23 times
- Followed by:1 members
Statement 1 -
Simplify the expression 2x – 2y = 1
X = y + ½
Not sufficient
Statement 2 –
X/Y > 1
X = -5, y = -2 result > 1
X = 5, y = 2 result > 1
Not sufficient
Combining the statements – x = y + ½
(Y + ½ ) / y > 1
1 + 1/2y > 1
1/2y > 1 – 1 = 1/2y > 0
i.e. y > 0 therefore x has to be positive as well. Answer C
Simplify the expression 2x – 2y = 1
X = y + ½
Not sufficient
Statement 2 –
X/Y > 1
X = -5, y = -2 result > 1
X = 5, y = 2 result > 1
Not sufficient
Combining the statements – x = y + ½
(Y + ½ ) / y > 1
1 + 1/2y > 1
1/2y > 1 – 1 = 1/2y > 0
i.e. y > 0 therefore x has to be positive as well. Answer C