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buku = X
pensil = y
5X + 4y = 18000.......(1)
8X + 3y = 23700.......(2)
5X + 4y = 18000 => x8 => 40X + 32y = 144000
8X + 3y = 23700 => x5 => 40X + 15y = 118500
kedua persamaan di eliminasi(dikurangi), maka akan menjadi :
17y = 25500
y = 1500
subtitusi y=1500 ke persamaan 1
5X + 4y = 18000
5X + 4x1500 = 18000
5X + 6000 = 18000
5X = 18000 - 6000
5X = 12000
X = 12000/5
X = 2400
Maka=
5X + 3y
= 5x2400 + 3x1500
= 12000 + 4500
= 16500