To model the situation with a linear equation, we define:
- \( y \) as the total cost (in dollars),
- \( x \) as the number of hours worked.
The plumber charges a consultation fee of $25 and $60 for each hour of service. Thus, the total cost can be represented as:
\[ y = 60x + 25 \]
So the correct equation is:
\[ y = 60x + 25 \]