penyelesain sistem persamaan linear tiga variabel berikut x+2y+z= 7 3x -2y-z= 5 2x +3y+2z= 13

x+2y+z=7
3x-2y-z=5
----------------- +
4x=12
x=3
3x-2y-z=5 |×3|9x-6y-3z=15
2x+3y+2z=13 |×2|4x+6y+4z=26
---------------------------- +
13x+z=41
13x+z=41
13 (3)+z=41
39+z=41
z=41-39
z=2
x+2y+z=7
3+2y+2=7
5+2y=7
2y=7-5
2y=2
y=1

semoga membantu