8. The mother gave birth to Hung when she was 30 years old. The total age of the two is 46 years...

Therefore, Hung is 38 years old now and the mother is 8 years old now.

By solving the system of equations, we can find the current ages of Hung and the mother: x = 38 and y = 8.

Now we have a system of two equations with two variables: x - y = 30 and x + y = 46.

The total age of the two is 46 years now. So, x + y = 46.

According to the problem, the mother gave birth to Hung when she was 30 years old. So, the age difference between the mother and Hung is x - y = 30.