Question

X + y + z =8
2 x +3y-z=3
3x+7y-6y=15

Answer 1

Bom dia Luanh

x + y + z = 8
2x + 3y - z = 3
3x + 7y - 6z = 15  (coloquei 6z)

3x + 4y = 11
9x + 13y = 63 
9x + 12y = 33
y = 30

3x + 120 = 11
3x = 11 - 120 = -109
x = -109/3

x + y + z = 8
-109/3 + 30 + z = 8
-109 + 90 + 3z = 24
3z = 24 + 109 - 90
3z = 43
z = 43/3

S = ( -109/3, 30, 43/3 )