Write a system of equations to describe the situation below, solve using substitution, and fill
in the blanks.
A company that teaches self-improvement seminars is holding one of its seminars in Stafford.
The company pays a flat fee of $50 to rent a facility in which to hold each session.
Additionally, for every attendee who registers, the company must spend $18 to purchase
books and supplies. Each attendee will pay $23 for the seminar. Once a certain number of
attendee register, the company will be breaking even. What will be the company's total
expenses and revenues? How many attendees will that take?

Please I need help

Revenue and Expense = $230

No. of attendees: 10

Step-by-step explanation:

Let n be the no. of attendees

Expense = 50 + 18n

Revenue = 23n

Break even when:

50 + 18n = 23n

50 = 5n

n = 10

23n = 230

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional