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If x>2 and y>-1,then which of the following statements is necessarily true?
xy>-2
-x<2y
xy<-2
-x>2y
This kind of questions must be solved using the counter example method.
x = 100 and y = -1/2 rules out option a) x = 3 and y = 0 rules out options c) and d) Option b) is correct.
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