Nilai x yang memenuhi sistem persamaan linear 5y - 8z = -19 5x - 8z = 6 3x - 2y = 12 adalah..... BESERTA CARA !! thanks

jawab

5y - 8z = -19
5x - 8z = 6
...................(-)
- 5x + 5y = - 15 atau x - y =  3

x - y = 3 ..|kali 3
3x - 2y = 12

3x - 3y = 9
3x - 2y = 12 ||(-)
-y = - 3
y = 3

x - y = 3
x = 3+y  = 3 + 3
x = 6

5x - 8z = 6
5(6) - 8z = 6
-8z = 6  - 30
- 8z = - 24
z = 3
(x,y,z) = (6, 3, 3)

5y-8z=-19
5x-8z=6
________ -
5y-5x=-25
y-x=-5
2y-2x=-10

3x-2y=12
2y-2x=-10
________+
x=2
y=-3
z=1/2