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5x + 4y = 30000 |x2| 10x + 8y = 60000 -
2x + 6y = 23000 |x5| 10x + 30y = 115000
22y = 55000. y=2500. pensil=2500
jadi, x=4000. pulpen=4000
3x + 2y = 12000 + 5000 = 17000
5x + 4y = 30.000 dikali 2 10x + 8y = 60.000
2x + 6y = 23.000 dikali 5 10x + 30y = 115.000 dieliminasi menjadi
-22y = - 55000
y= 55000/22 = 2500
2x + 6y = 23.000
2x + 6(2500) = 23.000
2x + 15.000 = 23.000
2x = 8000
x= 4000
sehingga harga 3 pulpen dan 2 pensil adalah
3(4000) + 2(2500) = 12000 + 5000 = 17.000
jadi yang harus di bayar tika adalah Rp 17.000,-
dicek lg ya..