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y-wiek Agnieszki
x+1=2y
x=y+5
y+5+1=2y
x=y+5
y=6
x=6+5=11
Odp. Basia ma 11 lat a Agnieszka ma 6 lat
y-Baśka
(x-1)rok temu wiek Agnieszki
(y-1)-rok temu, wiek Basi
{x=y+5/*(-1)
{x-1=2(y-1)
{-x+y=-5
{x-2y=-1
------------
-y=-6
y=6
x=11
Rozwiązanie całkowicie poprawne.