asia i kasia maja razem 18 lat,trzy lata temu asia była 2 razy starsa od kasi.
ile lat ma kasia a ile asia?
x-wiek kasi
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x-wiek Kasi
y- wiek Asi
{x+y=18 /·(-1)
{y-3=2(x-3)
{ -x-y=-18
{y-3= 2x-6
+____________
-x-y+y-2x=-18-6+3
-3x=-21 /:(-3)
x=-7
x=7
x+y=18
y=18-7
x=7
y=11