Odpowiedź:
x-liczba łabędzi
y-liczba kaczek
[tex]\left \{ {{x=0,1(x+y)} \atop {y-10=8}} \right.[/tex]
[tex]\left \{ {{x=0,1x+0,1y} \atop {y=18}} \right.[/tex]
[tex]\left \{ {{0,9x=0,1y} \atop {y=18}} \right.[/tex]
[tex]\left \{ {{x=\frac{1}{9}y } \atop {y=18}} \right.[/tex]
[tex]\left \{ {{x=2} \atop {y=18}} \right.[/tex]
