Question

X+2y+4z=0
X-14z=0
2z=4

Answer 1

x + 2y + 4z = = 
x - 14z = 0
2z = 4
z = 4/2 = 2 *****

x - 14 ( 2)  = 0
x - 28 = 8
x = 28 *****
28 + 2y + 4 ( 2 ) = 0
28 + 2y + 8 = 0
36 + 2y = 0
2y = -36
y = - 18 ****
PROVA
X + 2Y + 4Z = 0
28 + 2 ( -18) + 4 ( 2 ) = =
28 - 36 + 8 = 0
0 = 0  CONFERE