Metode eliminasi dan subtitusi X+y-z=13 X+z=11 2x-z=16

x+z = 11
2x-z = 16
-------------- +
3x = 27
x = 9

x + z = 11
9 + z = 11
z = 11 - 9
z = 8

x + y - z = 13
9 + y - 8 = 13
y = 13 - 9 + 8
y = 12

jadi, x = 9, y = 12, z = 8