18. Elyse has a gift card that she can use to rent movies online. The graph shows the amount of
money remaining on her gift card based on the number
of movies she rents.
a. Write an equation to represent the situation.
b. What is the y-intercept, and what does it mean in the
context of the situation?
c. What is the slope, and what does it mean in the context
of the situation?

Step-by-step explanation:

The complete question in the attached figure

Let

x > the number of movies

y > the amount of money remaining on her gift card

we know that

The slope of the linear equation is equal to the unit rate

take two points from the graph

(0,18) and (2,12)

Find the slope

---> is negative because is a decreasing function

That means > Each movie she rents cost her $3, so her  gift card balance will decrease $3 for every movie rented

The linear equation is equal to

For y=0

so

6 is the maximum number of movies that Elyse can rent on line

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72