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4x + 3y = 14500 == x3
12x + 20y = 60000
12x + 9y = 43500
11y = 16500
y = 1500
3x + 5.1500 = 15000
3x + 7500 = 15000
3x = 7500
x = 2500
2x + y = ??
2.2500 + 1500 = 5000 + 1500 = 6500
3x2.500=7.500
5x1.500=7.500+
=15.000
Jadi,2 buku =5.000 dan 1 pensil berharga 1.500
Totalnya:5.000+1.500+6.500