The cost of a ticket to an amusement park is $42.00 per person. for groups of up to8 people, the cost per ticket decreases by $3.00 for each person in the group. marco's ticket cost $30.00. write and solve an equation to find the number of people in marco's groupe.

X=number of groups.
8x=number of people
f(x) =price of the ticket.
we suggest this function:
m=slope=-3

f(x)=-3x+42
f(x)=-3x+42

Therefore:
f(x)=30
30=-3x+42
3x=42-30
3x=12
x=12/3
x=4

 number of people in marco´s groupe=8x=8(4)=32

Solution:there are 32 people in Marco´s groupe. 

B

the brainliest one is right but i just wanted to let yall know its B to make it easier

Step-by-step explanation:

u the brainliest one :0