Tolong bantu jawab ya terimakasih. y:? X+2y: 8, jika x:8 dan x:10 y? x+2y:8 y? x-2y:4, jika x:0?

x + 2y = 8

jika x = 8
x + 2y = 8
8 + 2y = 8
2y = 0
y = 0
jika x = 10
x + 2y = 8
10 + 2y = 8
2y = -2
y = -1


x - 2y = 4
jika x = 0
x - 2y = 4
0 - 2y = 4
-2y = 4
y = -2