Tentukan nilai x,y,z dari persamaan berikut! 3x+4y-5z=12 2x+5y+z=17 6x+2y+3z=17

2x+5y+z= 17
z=17-2x-5y

3x+4y-5z= 12
3x+4y-5(17-2x-5y) =12
3x+4y-75+10x+25y = 12
3x+10x+4y+25y= 12+75
13x+29y = 87

6x+2y+3z=17
6x+2y+3(17-2x-5y) = 17
6x+2y+51-6x-15y = 17
6x-6x+2y-15y = 17-51
-13y = -34
y= -34/-13 =