To find the cost of the drink \( x \), we can start from the equation you provided:
\[ x + 4.50 = 6.75 \]
Now, we will solve for \( x \):
- Subtract \( 4.50 \) from both sides of the equation:
\[ x = 6.75 - 4.50 \]
- Perform the subtraction:
\[ x = 2.25 \]
So, the cost of the drink is:
\[ x = \text{$}2.25 \]