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y - cena zeszytu
2x + 3y = 44,20
x = 5y
podstawiamy:
2 * 5y + 3y = 44,20
10y + 3y = 44,20
13y = 44,20 /:13
y = 3,40
wynik podstwiamy tu: x = 5y
x = 5 * 3,40
x = 17
Odpowiedź:
x - cena książki = 17 zł
y - cena zeszytu = 3,40 zł
Spr:
2x + 3y = 44,20
2 * 17 + 3 * 3,40 = 34 + 10,20 = 44,20