Nilai y yang memenuhi sistem persamaan 2x+y-z=5 3x-2y+z=-4 X+3y-3z=10 Adalah...

2x + y - z = 5
3x - 2y + z = - 4
x + 3y - 3z = 10

x + 3y - 3z = 10
x = 10 - 3y + 3z

2x + y - z = 5
2(10 - 3y + 3z) + y - z = 5
20 - 6y + 6z + y - z = 5
- 5y + 5z = 5 - 20
- 5y + 5z = - 15

3x - 2y + z = - 4
3(10 - 3y + 3z) - 2y + z = - 4
30 - 9y + 9z - 2y + z = - 4
- 11y + 10z = - 4 - 30
- 11y + 10z = - 34

- 5y + 5z = - 15|× 2
- 11y + 10z = - 34|× 1

- 10y + 10z = - 30
- 11y + 10z = - 34
____________ —
y = 4

Jadi, Nilai y = 4