please see the last part of the question, my daughter needs help to understand how to answer it

Given the linear equation:
[tex]y=6x[/tex]Where:
x = Independent variable
y = Dependent variable
Let:
y = Total amount of money
x = Number of hours
A possible situation is a person who works a determined number of hours. The person will earn a determined amount of money per hour. For example a person who works at a supermarket earns $6 dollars per hour:
y = 6x
If the person works 4 hours then the total amount of money is:
y = 6(4) = $24