You purchased a shirt on sale for $17.55. The discount on the shirt was $5.85. What was the original price of the shirt?

Which equation best models the scenario above?

x + 5.85 = 17.55

x - 5.85 = 17.55

x + 17.55 = 5.85

x - 17.55 = 5.85

The original price of the shirt is simply the sum of the purchased price and the discount price, that is:

original price = $17.55 + $5.85

original price = $23.40

The equation that best model this scenario is:

x - 5.85 = 17.55

where x is the original price