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4p+1b=13500
(eliminasi)
4p+6b=31000
4p+1b=13500
7b=17500
b=2500
2p+(3×2500)=15500
2p+7500=15500
2p=15500-7500
2p=8000
p=4000
1p+2b=2500+8000=10500
y = harga buku tulis
2x+3y = 15.500| x1
4x+1y = 13.500 | x3
12x+3y = 40.500
2x + 3y = 15.500 dikurang jadi
10x = 25.000
x = 2500
4x + y = 13.500
10000 + y = 13.500
y = 3.500
x + 2y = 2500 + 3500 = 6.000