Question

Nilai x yang memenuhi sistem persamaan linier.
(i) 2x - y = -8
(ii) 2y + z = 8
(iii) 3x + y + z = -3
adalah......

Answer 1

2x-y=-8 4x-2y=-16 2y+z=8 2y+z=8 =4x+z=-16 3x+y+z=-3 x-y=-13 2x-y=-8 x=5 y=18 z=-16-4x=-16-20=-36

Answer 2

1. 2x - y = -8
-y = -8 -2x
y = 8 + 2x
2. 2(8 + 2x) + z = 8
16 +4x + z = 8
z = 8-16 -4x
z = -8 -4x
3. 3x + 8 + 2x -8 - 4x = -3
3x + 2x -4x. = -3 -8 + 8
x. = -3
tinggal dimasukkan kerumus