kakak tolong bantu ya beserta caranya

x + 2y + 3z = 5
x+ y + z = -1
____________ _
y + 2z = 6

3x + 3y + 3z = -3
3x - 2y -z =-9
____________ _
5y + 4z = 6

2y + 4z = 12
5y + 4z =6
_________ _
-3y = 6
y= -2

y+2z = 6
-2 +2z =6
2z= 8
z = 4

x+y+z = -1
x -2 +4 = -1
x = -3

x+ y + z = -3 -2 +4 = -1

ps : itu bahkan udah ada di soalnya.



3.
x - y + z = 3
2x + y - 3z = -5
3x + 2y + z = 16

2x - 2y + 2z = 6
2x + y - 3z = -5
___________ _
- 3y + 5z = 11

3x - 3y + 3z = 9
3x + 2y + z = 16
___________ _
-5y + 2z = -7

-15y+6z = -21
-15y+25z = 55
_______ _
-19z = -76
z = 4

-3y + 5(4) = 11
-3y =-9
y= 3

x-y+z =3
x-3 + 4 = 3
x =2


himpunan penyelesaian : {(2,3,4)}