Jawaban:
misal x= buku , y=pulpen
model matematika
5x+4y=55.000 ...... persamaan 1
4x+5y=53.000 ...... persamaan 2
eliminasi 1&2
5x+4y=55.000 |×4| 20x+16y=220.000
4x+5y=53.000 |×5| 20x+25y=264.000
----------------------------- -
-9y= -45.000
y= -45.000/-9 = 5.000
substitusi nilai y=5000 kepersamaan 1
4x+5y=220.000
4x+5(5.000)=220.000
4x+25.000=220.000
4x=220.000-25.000
4x=28.000
x=28.000/4=7.000
karna ari membeli 2buku dan 3 pulpen maka
2x+3y=2(7.000)+3(5.000)=14.000+15.000=29.000
jadi kembalian 50.000-29.000=21.000
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Jawaban:
misal x= buku , y=pulpen
model matematika
5x+4y=55.000 ...... persamaan 1
4x+5y=53.000 ...... persamaan 2
eliminasi 1&2
5x+4y=55.000 |×4| 20x+16y=220.000
4x+5y=53.000 |×5| 20x+25y=264.000
----------------------------- -
-9y= -45.000
y= -45.000/-9 = 5.000
substitusi nilai y=5000 kepersamaan 1
4x+5y=220.000
4x+5(5.000)=220.000
4x+25.000=220.000
4x=220.000-25.000
4x=28.000
x=28.000/4=7.000
karna ari membeli 2buku dan 3 pulpen maka
2x+3y=2(7.000)+3(5.000)=14.000+15.000=29.000
jadi kembalian 50.000-29.000=21.000