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pensil = y
4x + 3y = 22.500 x1 4x + 3y = 22,500
2x + 7y = 19.500 x2 4x + 14y = 39,000 (dikurangi)
-11y = -16,500
y = -16500/ -11
= 1500
4x + 3y = 22500
4x + 3.1500 = 22500
4x = 22500 - 4500
4x = 18000
x = Rp 4500
5x + 4y = 0
5.4500 + 4. 1500 = 0
22500 + 6000 = 0
= Rp 28500