stmt1,
2x-2y=1
x-y=1/2
x=1,y=1/2,x and y are +ve
x=-1/2,y=-1,x and y are -ve
Insuff
stmt2,
x/y>1
x=2,y=1,x and y are +ve
x=-2,y=-1,x and y are -ve
Insuff
1 and 2,
x-y=1/2 and x/y>1
x/y>1 or x-y/y>0
1/2/y>0-->y is +ve
Since y is +ve to satisfy the eqn x-y=1/2 surely x must be +ve
Suff
Pick C
Pick C
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Source: Beat The GMAT — Data Sufficiency |
