x-y=1 , x+y =3 হলে , (x,y) =কোনটি?
A
(1,2)
B
(2,1)
C
(1,3)
D
(3,1)
Correct Answer: (2,1)
2 - 1 = 1, 2 + 1 = 3, (x,y) = (2, 1)