tolong beserta caranya!

x+y = 3
x = 3-y ....(1)
x^2-y^2=6 ....(2)

subs (1) ke (2)
(3-y)^2 -y^2 = 6
9 - 6y + y^2 -y^2 =6
-6y = -3
y= 1/2
x= 3-1/2 = 2 1/2