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Verified answer
2y=8y=4
eliminasi
2x-3y+z=-8| x1 | 2x-3y+z=-8
x+y-z= 3 | x2| 2x+2y-2z=6
=-5y+3z= -14
sekarang subtitusi
-5y+3z= -14
-5(4) + 3z = -14
-20+3z = -14
3z= -14+20
3z= 16
z= 16/3
z=5 1/3 atau 5,3