metode grafik x+y=6 dan 2x-y=0

x+y=6 | dikali 2 2x+2y=12
2x-y=0 | dikali 1 2x-y=0
___________-
3y=12
Y=12/3
Y=4
X+y=6
2x-y=0
_______+
3x=6
x=6/3
x=2 hp=(2,4)