Bantuin yang sistemnya persamaan dong huhu:(

Jawaban:

3×-24-3z=5 (1)

x+y-2z =3 (2)

x-y+z = -4 (3)

(2) dan (3) (1) dan (2)

x+y-2z =3 3x – 2y – 3z =5|×1

x-y+z = -4 x + y – 2z = 3 |×2

2× -z = -1….. (4) 3x – 2y – 3z =5

2x + 2y – 4z =6

5x – 7z =11…..(5)

(4) dan (5)

2x – z = -1 |×5

5x – 7z=11 |×2

10x – 5z = -5

10× – 142 = 22

9z = -27

z = – 3