4x + 2y =12. x + y = 6. cari nilai x dan y dengan cara subsitusi

x + y = 6
y = 6-x
x = 6-y
4(6-y) + 2y = 12
24 - 4y + 2y = 12
-2y = -12
y = 6
4x + 2(6-x) = 12
4x + 12 - 2x = 12
2x = 0
x = 0
jadi x = 0, y = 6