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buku = x
pensil = y
= 3x + 2y = 13.000 [ x5 ] 15x + 10y = 65.000
5x + 3y = 21.000 [ x3 ] 15x + 9y = 63.000
_--------------------------- -
y = 2.000
3x + 2.2000 = 13.000
3x + 4.000 = 13.000
3x = 9.000
x = 3.000
jadi, jika tano =>
2.3000 + 4.2000
= 6000 + 8.000
= 14.000
3a+2b=13000
5a+3b=21000
»dieliminasi
9a+6b=39000
10a+6b=42000
____________ _
-a=-3000
a=3000
3a+2b=13000
9000+2b=13000
4000=2b
b=2000
2a+4b=..?
2.3000 + 4.2000
=6000+8000
=14000
jadi Tano harus membayar Rp14.000,00