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Pensil (y)
4x + 3y = 12500 | dikali 1
2x + y = 5500 | dikali 2
Pake metode eliminasi subsitusi
4x+3y = 12500
4x + 2y = 11000
----------------- -
y = 1500
Maka 2x + y = 5500
2x = 5500 - 1500
2x = 4000 maka x = 2000 ;)
Jadi harga sebuah buku dan pensil adalah Rp.2000 dan Rp.1500