Q. What is the value of x ?
(1) -(x + y)= x- y
(2) x + y = 2
Sol: This is a DS Qs where we have to find a definite value of x.
Now, we don't have any data in Qs stem. So, we can skip that.
Going, quickly to St. 1.. -(x+y)=x-y---> Expanding the brackets the equation becomes--> -x-y=x-y
Now cancelling -y from both ends (or in other words adding +y on both sides), we get -x=x to give us finally 2x=0--> giving us x=0
As , we have a definite value of x , now St.1-->Suff--> Ans may be AD
St.2 --> x+y=2.. now x and y can take diff. integral or fractional values (nothing mentioned in Qs stem ) . So, we can't figure out exact value of x.
Hence, St 2--> Insuff and ans IMO
Hope this helps(if correct)