1. Here, it could be x=y=0,1,2... or x=1 and y=-1. Insuff
2. Here, it could be x=y=0 or x=1, y=-1. Insuff.
Together, nothing conclusive. E.
I am the master of my fate. I am the captain of my soul.
Please consider giving +1 Kudos if deserved!
DS - If negative answer only, still sufficient. No need to find exact solution.
PS - Always look at the answers first
CR - Read the question stem first, hunt for conclusion
SC - Meaning first, Grammar second
RC - Mentally connect paragraphs as you proceed. Short = 2min, Long = 3-4 min