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y - banknoty 50 zł
200x + 50y = 12000
y+10 = x
200(y+10) + 50y = 12000
200y + 2000 + 50y = 12000 | - 2000
250y = 1000 | /250
y = 4-banknoty 50złotowe
4+10 = 14- banknoty 200złotowe
y - banknoty 50 zł
200x + 50y = 12000
y+10 = x
200(y+10) + 50y = 12000
200y + 2000 + 50y = 12000 | - 2000
250y = 1000 | /250
y = 4
4+10 = 14
Pan Kowalski otrzymał 4 banknoty 50 zł i 14 banknotów 200 zł .