Applications of linear systems

$v$ corresponds to age of father.

$s$ corresponds to age of the son.

Father and son are 34 years old together.

Set up the equation.

$v+s=34$

The difference in their ages is 26 years.

Gleichung aufstellen.

The age of the son is 4 years.

Calculate age of the father.

$34-4=30$

The age of the father is 30 years.

$\Rightarrow$ The age difference is $26$ years if the father is $30$ years old and the son is $4$ years old.