Is the answer C?
1) 2x-2y = 1
x-y = 1/2
Possible values are: x = 0, y=-1/2
x=1, y=1/2
So, we can't say.
2) x/y > 1
x>y
- Can't say
Combining 1 & 2
- x and y are positive.
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Source: Beat The GMAT — Data Sufficiency |
Jay,
from x-y= 1/2, x could be -4.5 and y could be -5 and x-y would still equal 1/2. I am not sure if your logic for (1) is right
from x-y= 1/2, x could be -4.5 and y could be -5 and x-y would still equal 1/2. I am not sure if your logic for (1) is right
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Is it C ?owodee wrote:Are x and y both positive?
(1) 2x - 2y = 1
(2) x/y > 1
OA after a few replies
1 - insufficient. Multiple values of x and y satisfy x-y = 1/2
2 - insufficient. x and y can be either both positive or both negative.
Together,
x - y = 1/2
Dividing both sides by y
x/y - 1 = 1/2y
We know x/y > 1 and so left side of the eqn is positive. This implies
1/2y is positive and so y is positive.
If x/y > 1 and y is positive, then x has to be positive.
So C ?
