To represent the cost of a drink \( x \), you can set up the equation based on the information provided:
\[ x + 3.19 = 5.61 \]
Now, to solve for \( x \), subtract \( 3.19 \) from both sides:
\[ x = 5.61 - 3.19 \]
Calculating the right side:
\[ x = 2.42 \]
So the cost of a drink \( x \) is:
\[ x = 2.42 \]