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3b+4p=58000
3(3p)+4p=58000
9p+4p=58000
13p=58000
p=4462
sehingga, b = 3p
b = 3 x 4462
b = 13.386
misal harga buku = x
harga pensil = y
maka diperoleh persamaan :
x = 3y
3x + 4y = 58.000
subtitusi nilai x menjadi :
3(3y) + 4y = 58.000
9y + 4y = 58.000
y = 58.000 / 13
y = 4.462
maka harga 1 buku = 3 x 4.462 = Rp 13.385