Question

a supermarket offers a delivery service. if a customer pays $9 per month, each delivery costs just $2. write an equation that shows how the total cost for a month, y, depends on the number of deliveries, x. do not include dollar signs in the equation.

Explanation:

Step1: Identify fixed and variable costs

The fixed cost per month is $9 (this is a constant, doesn't depend on the number of deliveries). The variable cost is $2 per delivery, so for \( x \) deliveries, the variable cost is \( 2x \).

Step2: Form the total cost equation

Total cost \( y \) is the sum of fixed cost and variable cost. So \( y = 9 + 2x \).

Answer:

\( y = 2x + 9 \)