Ada yg bisa bantu jawab gakk? Makasih

x + 2y = -4 --------> x = -4 - 2y

2x + z = 5
2(-4 - 2y) + z = 5
-8 - 4y + z = 5
-4y + z = 5 + 8
-4y + z = 13

Eliminasikan,,
-4y + z = 13 (kalikan 3)
  y - 3z = -6 (kalikan 1)
_______________________

-12y + 3z = 39
     y -  3z =  -6
_______________  +

-11y = 33
y = -3

Masukkan y ke:
y - 3z = -6
-3 - 3z = -6
-3z = -6 + 3
-3z = -3
z = 1

Masukkan y ke:
x + 2y = -4
x + 2(-3) = -4
x - 6 = -4
x = -4 + 6
x = 2

Nilai x = 2, y = -3 dan z = 1