Final answer:
To find the original price of the yellow bath towel, set up an equation: x - $2.15 = 0. Solve for 'x' by adding $2.15 to both sides of the equation. The original price of the towel was $2.15.
Step-by-step explanation:
To find the original price of the yellow bath towel, we can set up an equation using the given information. Let's assume the original price is 'x'.
According to the problem, Elena buys the towel during a sale and pays $2.15, which is less than the original price. We can set up the equation:
x - $2.15 = 0
To solve for 'x', we can add $2.15 to both sides of the equation:
x = $2.15
The original price of the yellow bath towel was $2.15.