Tentukan nilai 2x - 3y + 2 Dari sistem persamaan : 2x + y = 3 2x - z = 3 Y + 2z = 1

pers (2) dan (3)
2x - z = 3 | 2 | 4x - 2z = 6
y + 2z = 1 | -1 | -y - 2z = -1
__________-
4x + y = 7..... (4)

pers (1) dan (4)
2x + y = 3 | 2| 4x + 2y = 6
4x + y = 7 | 1 | 4x + y = 7
__________-
y = -1

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

2x - z = 3
2(2) - z = 3
4 - z = 3
-z = 3 - 4
- z = -1
z = 1

2x - 3y + 2 = 2(2)- 3(-1) + 2
= 4+3+2 =9