x + 2y = -4 2x + z = 5 y - 3z = -6 tolong dibantu..tent.HP sistem persamaannya....

x + 2y = -4 »» y = (-4 - x)/2 ...(1)
2x + z = 5 »» z = 5 - 2x ...(2)
y - 3z = -6 ...(3)

Substitusi (1) dan (2) ke (3)
(-4 - x)/2 - 3(5 - 2x) = -6
(-4 - x)/2 - 15 + 6x = -6
-4 - x - 30 + 12x = -12
11x - 34 = -12
11x = 22
x = 2

x + 2y = -4
2 + 2y = -4
2y = -6
y = -3

2x + z = 5
2(2) + z = 5
z = 1