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3x + 4y = 14400 / dikali 2 2x + 3.1800 = 10200
2x + 5400 = 10200
6x + 9y = 30600 2x = 10200 - 5400
6x + 8y = 28800 2x = 4800
1y = 1800 x = 2400
y = 1800
jadi 1 buku dan 2 bulpen = 1x + 2y = 1.2400 + 2.1800 = 2400 + 3600 = 6000
pulpen = p
2b+3p = 10.200 (x3)
3b+4p = 14.400 (x2)
6b+9p = 30.600
6b+8p = 28.800
------------------- -
1p = 1.800
2b+3p = 10.200
2b+3x1.800 = 10.200
2b+5.400 = 10.200
2b = 10.200-5.400
2b = 4.800
b = 4.800/2
b = 2.400
b+2p
2.400 + 2x1.800
2.400 + 3.600
6.000
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