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3x+2y=29.000
2x+2y=22.000
____________ _
x=7000
3x+2y=29.000
3(7.000)+2y=29.000
2y=29.000-21.000
y=8000/2
y=4.000
jadi harga 1 pulpen adalah Rp.4000,00
pulpen=y
3x+2y=29.000|x2| 6x+4y=58.000
2x+2y=22.000|x3| 6x+6y=66.000
__________________ -
-2y= -8.000
y= 4.000
pulpen=4.000