bantuin dong beserta caranya masih bingung nih :(

mis.pensil=x,,,,buku=y
pers:5x=2y
4x+3y=23000
dit;2x+2y
jb;;;4x+3(5/2x)=23000
4x+15/2x=23000
23x/2=23000
x=46000/23
x=2000


5x=2y
10000=2y
y=5000
2x+2y=2(2000)+2(5000)
=14000