tolong dibantu ya yang ada di gambarnya terima kasih

z = 2-2y & x= 5+y >> masukin kerumus x-y+z=9
jadi: y= -1
X-Z = (5-1)-(2-2(-1))= 0

x - y = 5

x - y + z = 9
5 + z = 9
z = 4

2y + z = 2
2y + 4 = 2
2y = -2
y = -1

x - y = 5
x - (-1) = 5
x = 4

x - z = 4 - 4 = 0