2x - 2y - z = 3 ... (1) 4x + 5y - 2z = -3 ... (2) 3x + 4y - 3z = -7 ... (3) Tolong bantu yah tentang Sistem persamaan tiga variable Makasih ..

2x -2y-z = 3 kalikan 2
4x+5y-2z = -3 kalikan 1

4x-4y-2z = 6
4x+5y-2z = -3
--------------------- -
-9y = 9
y = 9/-9
y = -1

4x+5y-2z = -3 kalikan 3
3x+4y-3z = -7 kalikan 2

12x+15y-6z = -9
6x+8y-6z = -14
------------------------ -
6x+7y = 5
6x + 7(-1) = 5
6x - 7 = 5
6x = 5+7
6x = 12
x = 12/6
x = 2

2x-2y-z = 3
2(2) - 2(-1) - z = 3
4 + 2 - z = 3
6 - z = 3
-z = 3-6
-z = -3
z = 3