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y = baju
3x + 2y = 280.000. 3
x + 3y = 210.00. (dikali). 2
9x + 6y = 840.000
2x + 6y = 420.000. (Dikurangi)
7x = 420.000
x = 60.000
Harga satu celana = RP. 60.000
Substitusi kan
x + 3y = 210.000
60.000 + 3y = 210.000
3y = 210.000-60.000
3y = 150.000
y = 50.000
Harga satu baju = RP. 50.000