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celana = b
2a + b = Rp. 140.000 (x2)
3a + 2b = Rp. 234.000 (x1)
4a + 2b = Rp. 280.000
3a + 2b = Rp. 234.000
_____________________-
a = Rp. 46.000
subtitusi :
2a + b = Rp. 140.000
2(Rp. 46.000) + b = Rp. 140.000
Rp. 92.000 + b = Rp. 140.000
b = Rp. 140.000 - Rp. 92.000
= Rp. 48.000
4a + 5b = 4(Rp. 46.000) + 5(Rp. 48.000)
= Rp. 184.000 + Rp. 240.000
= Rp. 424.000