Final answer:
The equation representing Amelia's savings situation is y = 20x + 100.
Step-by-step explanation:
To write an equation representing Amelia's savings situation, we can let x represent the number of weeks and y represent the amount of money in her savings account.
The initial amount in her savings account is $100, and she plans to save $20 per week. Therefore, the equation can be written as y = 20x + 100.