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buku = y = 3x
2y + 5x = 7.700
2(3x) + 5x = 7.700
6x + 5x = 7.700
11x = 7.700
x = 7.700/11
x = 700
5 pensil
5x = 5 × 700
5x = 3.500
p=pensil
1b=3p
7700=2b+5p
7700=2(3)p+5p
7700=6p+5p
7700=11p
7700/11=p
700=p
harga 5 pensil
5p=5(700)=3500