Gina paints beach scenes on notecards. She sells packages of 8 notecards for $8 for one package, $16 for 2 packages, and $24 for 3 packages. Which equation is the rule for the pattern if n is the number of packages and d is the selling price in dollars?

In this question, each package has 8 notecards.

one notecard costs $8

2 notecards cost $16

3 notecards cost $24

if n - number of packages

d - selling price in dollars

We can see that with each additional notecard bought the cost increases by $8

therefore there's a proportional relationship between n and d

As n increases, d increases by the same amount.

if we put it in an equation,

d = 8*n

n - 1 package and d is 8

if n - 2

d = 8*2

d = 16

Therefore we can use the following equation;

d=8n