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y - monety 5zł
{x + y = 14 /*(-5)
{2x + 5y = 43
{-5x - 5y = -70
{2x + 5y = 43
------------------- +
-3x = -27 /:(-3)
x = 9
14 - 9 = 5
spr. 2zł *9 + 5zł*5 = 18zł + 25zł = 43zł
Ania ma w dwuzłotówkach kwotę 18zł.