Answer:
The equation is: 
Her hourly wage before her raise was $11.50
Step-by-step explanation:
Consider the provided information.
Marietta was given a raise of $0.75 per hour, which gave her a new wage of $12.25 per hour.
Let the previous wage was $x.
It is given that her raise is $0.75, thus the expression is:

This gave her a new wage of $12.25 per hour.
Thus, the equation is:

Now solve for x.
Subtract 0.75 from both the sides.


Hence, her hourly wage before her raise was $11.50