tolong dijwb pkai cara ya....

x + 2y + 3z = 5
2x - 5y + z = -3
2x + y - 3z = 13

Substitusi nilai x

2x -5y + z = -3
2x + y -3z = 13
_____________-

0 -6y + 4z = -16

-6y + 4z = -16
4z = -16 + 6y
Z = (-16 + 6y)/4
Z = (-8 +3y)/2

Z = (-8 + 3y)/2
Z = 9,2




X + 2y + 3Z = 5
X + 2y + 3(-8 + 3y)/2 = 5

X + 2y -24 + 9 = 5
X = -2y + 15 = 19,6

2x + y - 3z = 13

2(-2y + 15) + y - 3(-8 + 3y)/2 = 13

-4y + 30 + y + 24 -9y = 13 x 2

-12y + 54 = 26
-12y = -28
y = 2,3





X + Y + Z =

19,6