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pulpen = y
3x + 6y = 15000 -> 3x + 6y = 15000
2x + 3y = 8000 -> 4x + 6y = 16000
-x = -1000
x = 1000
3x + 6y = 15000
3000 + 6y = 15000
y = 2000
4y + 2x = 4(2000) + 2(1000) = 8000 + 2000 = Rp10.000,00
pulpen=y
3x+6y=15000 -> 6x+12y=30000
2x+3y=8000 -> 6x+9y=24000
3y=6000
y=2000
y=2000-> 3x+6(2000)=15000 , 3x=3000, x=1000
Jadi, 2x+4y=2(1000)+4(2000) = 10.000