Using a system of equations, it is found that the father was (a + b - 1) years old when the son was born.
<h3>What is a system of equations?</h3>
A system of equations is when two or more variables are related, and equations are built to find the values of each variable.
In this problem, the <em>variables </em>are:
- Variable a: The son's age.
- Variable x: The father's age.
The son is a years old his <u>father is b times older</u>, hence:
The son was born when the father was years old, hence, that is, when .
Then:
The father was (a + b - 1) years old when the son was born.
To learn more about system of equations, you can take a look at brainly.com/question/24342899