The cost of a ticket to an amusement park is $42 per person. for groups of up to 8 people, the cost per ticket decreases by $3 for each person in the geoup. Marco's ticket cost $30. Write and solve an equation to find the number of people in marco's group.

X is the amount of groups

y is the amount of people

42 - 3x = 30

x (8) = y

42 - 3x = 30

-42 - 42

-3x = - 12

divide by - 3

x = 4, there were 4 groups of 8, substitute the 4 into the other equation

4*8 = 32

y = 32, There are 32 people in Marcos group

sorry, it's the best I could do.