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y = pensil
5x+4y=30.000|×2|10x+8y=60.000
2x+6y=23.000|×3|6x+18y=69.000(-)
-10y= -9.000
y= -9.000 : -10
y= 900
5x+4y=30.000
5x+4(900)=30.000
5x+3.600=30.000
5x=30.000-3.600
x= 26.400 : 5
x = 5.280
3x+2y
=3(5.280)+2(900)
=15.840+1.800
=17.640