Question

Tolong ya besok di kumpul

Answer 1

X+y-2z = 5
3x-y+z = 4
--------------- +
4x - z = 9

x+y-2z = 5 ( x2)
=
2x+2y-4z =10
4x +2y-z = 11
------------------- -
-2x-3z = -1

4x - z =9
-2x-3z =-1

4x - z =9
-4x-6z =-2
---------------- +
-7z = 7
z = -1

4x - (-1) =9
4x + 1 = 9
4x = 8
x = 2

x+y+2z=5
2+y+(-2)=5
y=5

x,y,z = 2,5,-1