To represent the cost of the drink, let's use \( x \) for the cost of the drink.
The equation based on the information provided is:
\[ x + 3.19 = 5.61 \]
Now, to solve for \( x \), we can subtract \( 3.19 \) from both sides:
\[ x = 5.61 - 3.19 \]
Calculating the right side:
\[ x = 2.42 \]
So, the cost of the drink is \( \text{$}2.42 \).
In summary:
- Equation: \( x + 3.19 = 5.61 \)
- Solution: \( x = 2.42 \)