pakai caranya ya tolongg:)

17.pulpen=a
pensil=b

6a+5b=11.200 |×4|24a+20b=44.800
8a+6b=14.400|×3|24a+18b=43.200 _
2b=1.600
b=1.600÷2=800
24a+20(800)=44.800
24a+16.000=44.800
24a=44.800-16.000
a=28.800÷24
a=1.200
jadi banyaknya
pulpen=5×1.200=6.000
pensil=8×800=6.400
6.000+6.400
12.400(A)