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pensil=p
4b+2p=13.000|x1| 4b+2p=13.000
3b+p = 9.000|x2| 6b+2p=18.000
------------------------ -
-2b =-15.000
b =-15.000/-2
b =7.500
3b+p=9.000
3(7.500)+p=9.000
22.500+p=9.000
22.500-9.000=p
13.500=p
5b+2p= 5(7.500)+2(13.500)
= 37.500+27.000
= 64.500
nb:itu kayaknya ada kesalahan soal