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3x+2y=8500
4x+1y=8000
eliminasi
3x+2y=8500| .1
4x+1y=8000| .2
=3x+2y=8500
8x+2y=16000
-5x =-7500
x=1500
4x+1y=8000
4(1500)+1y=8000
6000+1y=8000
1y = 8000-6000
1y=2000
y = 2000
1 pensil dan dua pulpen
1x+2y
1(1500)+2(2000)
1500+4000
5500
jadi kembaliannya 4500