Given x+y=10x+y=10x+y=10, which pair (x,y)(x,y)(x,y) consists of positive integers?
(0,10)(0, 10)(0,10)
(5,5)(5, 5)(5,5)
(11,−1)(11, -1)(11,−1)
(1,9)(1, 9)(1,9)