Answer:
To solve this equation, we need to isolate the variable x on one side of the equation. We can do this by subtracting 3.19 from both sides of the equation:
x + 3.19 - 3.19 = 5.61 - 3.19
This simplifies to:
x = 2.42
Therefore, the cost of a drink is $2.42.
Explanation: