x-wiek syna

y- wiek ojca

x+y=52

y-6=3(x-6)

x=52-y

y-6=3x-18

y-6=3(52-y)-18

y-6=156-3y-18

y+3y=156-18+6

4y=144 /:4

y=36

y-6=3(x-6)

36-6=3x-18

30+18=3x

48=3x /:3

16=x

x=16

y=36 wiec odp c