Question

Tolong bantu kerjakan tugas mtk ini, besok mau dikumpul, tolong bantunya kerjakan

Answer 1

X - 4y + z = 1 (I)
x + y + 2z = -4 (II)
-2x + y - z = 5 (III)

(I) dan (II)
x - 4y + z = 1
x + y + 2z = -4
___________ -
-5y - z = 5 (IV)

(I) dan (III)
2x - 8y + 2z = 2
-2x + y - z = 5
____________ +
-7y + z = 7 (V)

(IV) dan (V)
-5y - z = 5
-7y + z = 7
________ +
-12y = 12
y = -1

-5(-1) - z = 5
5 - z = 5
0 = z

x - 4(-1) + 0 = 1
x + 4 = 1
x = -3