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2x + y = 3000 kalikan 2 4x + 2y = 6000
3x + 2y = 4750
4x + 2y = 6000
---------------------- dikurangi
- x = - 1250
x = 1250
2x + y = 3000
2.1250 + y = 3000
2500 + y = 3000
y = 3000 - 2500
y = 500
Jadi harga buku 1250 dan pensil 500