EXAMPLE 2 Interpret Parts of an Expression The expression 8x + 12.5y + 6 gives the total cost in dollars of ordering x T-shirts and
y caps from a Web site. The cost includes a fee for shipping that is the same no matter
how many shirts or caps you order.
a. USE STRUCTURE What does the coefficient 8 represent in the expression? What
does the term 8x represent? Explain.
b. USE STRUCTURE What does the coefficient 12.5 represent in the expression?
What does the term 12.5y represent? Explain