To find the mathematical equation that describes Victoria's weekly earnings, we need to consider both components of her pay.
- She receives a flat rate of $100 per week.
- She earns $20 for each hour she works.
Let \( y \) be the total amount Victoria gets paid per week and \( x \) be the number of hours she works. The total pay can be represented by the equation:
\[ y = 100 + 20x \]
This means her total pay is the sum of the flat rate and the hourly pay.
Therefore, the correct response is:
y = 100 + 20x.