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Verified answer
Misalx = harga pensil
y = harga buku tulis
y = x + Rp.500
Maka
3y + 2x = Rp.9.000
3(x + Rp.500) + 2x = Rp.9.000
3x + Rp.1.500 + 2x = Rp.9.000
5x + Rp.1.500 = Rp.9.000
5x = Rp.9.000 - Rp.1.500
5x = Rp.7.500
x = Rp.7.500/5
x = Rp.1.500
y = x + Rp.500
y = Rp.1.500 + Rp.500
y = Rp.2.000
Jadi
Harga pensil = Rp.1.500
Harga buku tulis = Rp.2.000
Sehingga harga satu pensil dan satu buku tulis adalah
Rp.1.500 + Rp.2.000 = Rp.3.500