Final answer:
To calculate the number of sweaters Joey can buy, the equation is W = (300 - 195) / 15, where 195 and 15 are constants and W is the variable.
Step-by-step explanation:
Joey has a $300 gift card and buys an LED TV for $195. He plans to spend the rest on sweaters priced at $15 each. To find out how many sweaters Joey can purchase, we can write the equation W = (300 - 195) / 15. Subtracting the cost of the TV from the gift card amount gives us the remaining funds, and dividing by the price per sweater gives us the number of sweaters Joey can buy. In this equation, 195 and 15 are constants (as they represent set amounts), and W is the variable representing the number of sweaters.