jawab lagiii gambar ya !!!

=> -2 = x + 2
-2 -2 = x
-4 = x

=> 2x - y = 12
2.(-4) - y = 12
-8 -y = 12
-y = 12 + 8
-y = 20
y = -20

=> -8 = -2z
-8/-2 = z
4 = z
jadi x-y+z = -4 - (-20) + 4
= -4 + 20 + 4
= 20
(D)