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b:buku
p:pinsil
Jawab :
15b + 10p = 79000 x1
6b + 5p = 35000 x 2
15b +10p =79000
12b +10p =70000
3b= 9000
b = 9000/3
b = 3000
6b + 5p = 35000
6x3000+ 5p = 35000
18000 + 5p = 35000
5p = 35000 - 18000
5p = 17000
p = 17000 / 5
p = 3400
Harga 4 pinsil = 4 x 3400 = 13600. jawaban nya berarti a. 13.600