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pensil = x
pulpen = y
3x + 6y = 15.000
2x + 3y = 8000 x2 -
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3x + 6y = 15000
4x + 6y = 8000 -
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-1x = -1000
x = -1000/-1
x = 1000
3x + 6y = 15000 x2
2x + 3y = 8000 x3
------------------------------------------------
6x + 6y = 30000
6x + 9y = 24.000
--------------------------
-3y = 6000
y = 6000/3
y = 2000
4 pulpen x 2000 = 8000
2 pensil x 1000 = 2000
= 10.000