The cost varies directly with the number of tickets purchased. it costs $145 for 10 people to attend a concert. a. what is the constant of proportionality (k)? b. write the direct variation equation. c. home much does it cost for 8 people? d. graph this situation. be sure to label each axis and give the graph a title.

(a)

(b)

(c)

the cost of 8 people is $116

(d)

Graph is attached

Step-by-step explanation:

we are given

It costs $145 for 10 people to attend a concert

(a)

Number of people =10

Total cost =145

now, we can find constant  proportionality

k= ( total cost)/(number of people)

(b)

Let's assume

cost is C

number of people as x

so, we can set equation as

now, we can plug value

(c)

we can plug x=8

C=116

So,

the cost of 8 people is $116

(d)

we can draw graph