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pensil = y
2x+3y=10.500 |x2
3x+2y=12.000 - |x3
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4x+6y=21.000
9x+6y=36.000 -
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-5x = - 15.000
x = -15.000/-5
x = 3000
3x+2y=12.000
3(3000)+2y=12.000
9000+2y=10.500
2y=12.000-9000
2y=3000
y=3000/2 = 1500
1 lusin buku (x)=12x3000=36.000
1 lusin pensil = 12x1500= 18.000
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