Eliminasi Z 2x + y + z =7 x + 2y + z =8

2x+y+z=7
x +2y+z=8
--------------- -
x - y = -1
x = y -1

y - 1 + 2y = 8
3y -1 = 8
3y = 8+1
3y = 9
y = 9/3
y = 3

x = y - 1
x = 3 - 1
x = 2

Jawabannya adalah
x = 2
y = 3