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Beni 4x + 3y = 12500
Udin 2x +y = 5500
Penyelesaiannya menggunakan metode eliminasi.
4x+3y = 12500 |x1| 4x+3y = 12500 ........... persamaan 1
2x+y = 5500 |x2| 4x+2y = 11000 ............ persamaan 2
persamaan 1 dikurangi persamaan 2 menjadi
y = 1500
substitusi y ke 2x + y = 5500
2x + (1500) = 5500
2x = 5500 - 1500
2x = 4000
x = 2000
Jadi harga buku (x) = Rp. 2000 dan harga pensil (y) = Rp. 1500