harga 2 baju dan 1 celana adlah Rp 140.000,00, sedangkan harga 3 baju dan 2 celana Rp 235.000,00. Harga 4 baju dan 5 celana adalah..

2b+c = 140.000 (×2)
3b+2c= 235.000(×1)

= 4b+2c = 280.000
3b+2c = 235.000
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b = 45.000

= 2.45.000+c = 140.000
= 90.000+c =140.000
= c = 140.000-90.000
c = 50.000

jadi harga 4b+5c =
4.45.000+5.50.000=430.000