ok since I am going to have to do these bloody questions again, let me give it a shot
1. sufficient, because -2x > any positive number if x is also negative.
Eliminate choices BCE
2. insufficent, can be rewritten as 2x+5y = 20 - this opens itself to all possibilities ... X could be positive, y could be positive or x could be negative and y could be positive, or x could be positive and y could be negative.
Consequently - A is the correct answer.
Do enlighten me with the OA whenever you get some more responses.
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