Question 999530
(1/3)x+(1/3)y=1
(1/3)x-(1/3)y=-(5/3)


(1/3)x+(1/3)y=1
multiply equation by 3
x+y=3...........................(1)

(1/3)x-(1/3)y=-(5/3)
multiply equation by 3

x-y = 5........................(2)

add (1) & (2) 2x=8
x=4

plug x 
in x+y =3
4+y=3

y=-1