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p = b - 500.......2)
subtitusi pers 2) ke pers 1)
4b + 2(b-500) = 6500
4b + 2b - 1000 = 6500
6b = 6500 + 1000
b = 7500÷6
b = 1250
p = b-500
p=1250-500
p= 750
jadi harga sebuah buku dan 2 penggaris adalah b+2p = 1250 + 2(750) = 1250 + 1500 = 2750