The cost y (in dollars) for pizzas is proportional to the number x of pizzas purchased. It costs $78.75 for 7 pizzas. Write an equation that represents the situation

Answer 1

"The cost y (in dollars) for pizzas is proportional to the number x of pizzas purchased. It costs $78.75 for 7 pizzas. Write an equation that represents the situation"

We want to figure out how much each pizza costs. Look at the given information. If the cost was $78.75 for 7 pizzas, then divide the total cost by the number of pizzas to get the "unit rate", or cost per pizza.

78.75 / 7 = 11.25

So each pizza costs $11.25.

The cost (y), will depend upon how many pizzas (x) were purchased. If each pizza costs $11.25, then the equation is thus:

y = 11.25x