For this case we have the following equation:

We pose a problem associated with the equation:
Maria wants to raise $37 to buy a dress. She has raised $5. Also, working as a babysitter on weekends, you get $8 per hour. So:
x: Represents the amount of hours Maria must work to raise the $37 considering she has saved $5.
Thus, we have the following equation:

Answer:
Maria must work at least 4 hours on the weekend