Pada toko buku "Murah" adil membeli 4 buku, 2 pulpen, dan 3 pensil dgn harga 26.000.Bima membeli 3 buku, 3 pulpen dan 1 pensil dgn harga 21.500 dan citra membeli 3 buku Dan 1 pensil dgn harga 12.500. Jika Dina membeli 2 pulpen dan 2 pensil, maka ia harus membayar...
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pulpen = b
pensil = c
4a + 2b + 3c = 26.000
3a + 3b +1c = 21.500
3a + 1c = 12.500
2b +2c = ? 2( 3000 ) + 2 ( 2000 ) = 10.000
4a + 2b + 3c = 26.000 } 3
3a + 3b + c = 21.500 }2
12a + 6b + 9c = 78.000
6a + 6b + 2c = 43.000
6a + 7c = 35000
6a + 7c = 35000 } 1
3a + c = 12.500} 7
6a + 7c = 35000
21a + 7c = 87500
-15a = - 52500
a = 3500
3a + c = 12.500
3( 3500 ) + c= 12.500
c= 12500-10500
c= 2000
3a + 3b + c = 21.500
10.500 + 3b + 2000 = 21.500
3b + 12.500 = 21.500
3b = 21.500 - 12.500
3b = 9000
b = 3000