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harga 3 pena dan 8 pensil adalah 19.000
berapa harga 3 pena dan 4 pensil??
jawab : pena = N pensil = S
2N + 4S = 10.000 | x 2
3N + 8S = 19.000 | x 1 _
4N + 8S = 20.000
3N + 8S = 19.000 _
N = 1.000
2N + 4S = 10.000
2 (1.000) + 4S = 10.000
2.000 + 4S = 10.000
4S = 10.000 - 2.000
4S = 8.000
4 4
S = 2.000
3N + 4S = 3 (1000) + 4 (2.000) = 3.000 + 8.000 = 11.000