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y= pensil
5x+4y=18.000|x3|15x+12y=54.000
8x+3y=23.700|x4|32x+12y=94.800
______________ -
-17x=-40.800
x= -40.800/-17
x=2.400
5x+4y=18.000
5(2.400)+4y=18.000
12.000+4y=18.000
4y=18.000-12.000
4y=6.000
y=6.000/4
y=1.500
*harga 5 buju = 5x2.400=12.000
*harga 3 pensil = 3x1.500=4.500
pensil = y
5x+4y=18.000 | x8
8x+3y=23.700 | x5
40x+32y=144.000
40x+15y=118.500
------------------------ -
17y=25.500
y=25.500/17
y=1500
5x+4y=18.000
5x+4(1500)=18.000
5x+6000=18.000
5x=18.000-6000=12.000
x=12.000/5=2400
5 buku dan 3 pensil = 5x+3y
5x+3y = 5(2400)+3(1500)
= 12.000+4500
= 16.500
jadi 5 buku dan 3 pensil adalah 16.500