X+y+z=-6 x-2y+z=3 -2x+y+z=9

jawab

x + y + z = - 6
x - 2y + z = 3 "|| (-)
3y = -9
y = -3

x + y + z = - 6
-2x + y + z = 9 || (-)
3x = - 15
x = -5

x + y + z =  -6
-5 -3 + z = -6
-8 + z = - 6
z = 2

(x,y,z) = (-5,-3 , 2)

x + y + z = -6
x - 2y + z = 3
-------------------- -
3y = -9
y = -9/3
y = -3

x + y + z = -6
-2x + y + z = 9
---------------------- -
3x = -15
x = -15/3
x = -5

x + y + z = -6
-5 + (-3) + z = -6
-5 - 3 + z = -6
-8 + z = -6
z = -6 + 8
z = 2

Jadi HPnya adalah { -5 , -3 , 2}