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y=pensil
5X+2y=13000(x3)15X+6y=65000
3X+3y=10500(x5)15X+15y=31500
9y=33500
y=33500/9
y=?
Pensil=y
5x+2y=13000(3)15x+6y=39000
3x+3y=10500(2)6x+6y=21000
__________-
9x=18000
x=18000/9=2000
3(2000)+3y=10500
3y=10500-6000
y=4500/3=1500
Buku: 2000
Pensil:1500