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gasing=n
2m+4n=7000
5m+7n=13000
eliminasi gasing (n) dengan cara:
2m+4n=7000 (x7)
5m+7n=13000 (x4)
14m+28n=49000
20m+28n=52000
—————————— —
-6m+0=-3000
m=-3000/-6
m=500
1 buah kelereng Rp500,00
1 lusin atau 12 buah = 12 x 500 = Rp6000,00
5x+7x=13000 dikali 4
14x+28y=49000 coret yan sama
20x+28y=52000 dikurang kn
-6x=-3000
x =-3000/-6
x=500
12 x 500 =6000 harga 1 lusin kelereng