x-wiek ojca
y-wiek syna
x=3y
(x-7)=5(y-7)
3y-7=5y-35
3y-5y=-35+7
-2y=-28 |:(-2)
y=14
x=3*14
x=42
Odp: Ojciec ma 42 lata, a syn 14 lat.
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x-wiek ojca
y-wiek syna
x=3y
(x-7)=5(y-7)
x=3y
3y-7=5y-35
x=3y
3y-5y=-35+7
x=3y
-2y=-28 |:(-2)
x=3y
y=14
x=3*14
y=14
x=42
y=14
Odp: Ojciec ma 42 lata, a syn 14 lat.