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3b+4p = Rp. 6800 ⇔15b+20p = Rp. 34.000-
-14p= Rp. -11.200
p = -11.200÷(-14)
p = Rp.800
3b+4p = 6800
3b+(4×800) =6800
3b+3200 = 6800
3b = 6800-3200
3b = 3600
b = 3600÷3
b = 1200
harga pensil = Rp. 800
harga buku = Rp. 1200
jadi, harga 10 buku dan 15 pensil = 10b+15p
(10×1200)+(15×800)
12000+ 12000
=24.000