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Jadi, 3x + 2y = Rp. 280.000 (x1) → 3x + 2y = Rp. 280.000 → dikurang
x + 3y = Rp. 210.000 (x3) → 3x + 9y = Rp. 630.000
↓
- 7y = - Rp. 350.000
y = - Rp. 350.000
-7
y = Rp. 50.000
Untuk y = Rp. 50.000,maka
x + 3y = Rp. 210.000
x + 3(Rp. 50.000) = Rp. 210.000
x + Rp. 150.000 = Rp. 210.000
x = Rp. 60.000
6 baju & 6 kaos = .....
6x + 6y = 6(Rp. 60.000) + 6(Rp. 50.000)
= Rp. 360.000 + Rp. 300.000
= Rp. 660.000