Za 2kg bananów i 3kg jabłek zapłacono 14 zł gdyby kupiono 3kg bananów i 2 kg jabłek zapłacono by 16 zł. Ile zł zapłacono by za 1 kg bananów i 4 kg jabłek ? (układ równań)
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2x + 3y = 14zl / -3y
3x + 2y = 16zl
2x = 14zl - 3y
3x + 2y = 16zl
2x = 14zl - 3y
21zl - 4,5y + 2y = 16zl
21zl - 2,5 y = 16 / -21zl
-2,5y = -5zl
y = 2zl - cena kilograma jablek
x = 4zl - cena kilograma bananów
4zl + 4*2zl = 12 zl
Odp: Za kilogram bananów i 4 kilogramy jablek zaplacono 12 zl