if x - y '>' 10, is x - y '>' x + y ?
(1) x = 8
(2) y = -20




note that you can subtract x from both sides of the inequality, and add y to both sides, giving "is 0 '>' 2y?"
then divide by 2: "is 0 '>' y?"
so, the question is asking
"is y negative?"
--
don't forget that x - y '>' 10
statement (1)
if x = 8, then 8 - y '>' 10.
subtract 8 to give -y '>' 2, or, y '<' -2
so y is negative
sufficient
statement (2)
y is negative
sufficient
ans = D