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6x+4y=16000 (x3)
8x+3y=19000. (x4)
18x+12y=48000
32x+12y=76000
------------------------- --
-14x=-28000
x= -28000/-14
x=2000
6x+4y=16000
6(2000)+4y=16000
12000+4y=16000
4y=16000-12000
4y=4000
y=4000/4=1000
harga=2x+2y=2(2000)+2(1000)=4000+2000=6000