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4x+y+2z=250.000 |×3|
=> 6x+4y+6z=572.000
12x+3y+6z=750.000 -
________________
-6x+y=-178.000
6x-y=178.000
2) 4x+y+2z=250.000 |×2|
6x+2y+4z=431.000
=> 8x+2y+4z=500.000
6x+2y+4z=431.000 -
_______________
2x=69.000
x=34.500
3) 6x-y=178.000
6(34.500)-y=178.000
207.000-y=178.000
y=29.000
4) x+y=34.500+29.000
=63.500
Jadi, x+y adalah 63.500