5. The graph shows the total cost y and the number of shirts x purchased at a store. 80
60
Total cost (5)
(4, 60)
40
20
0
0
2 4 6 8
Number of shirts
Part A: Write an equation that represents the proportional relationship.
Part B: What is the cost of 20 shirts?

a

step-by-step explanation:

jjddbdhid r

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be