the cost of a birthday party at Classic Boon is $200 plus $4 per person. The cost for Fletcher's party came to $324. How many people came to his party?

Answer :

1)
y=cost of a birthday party
x=number of people. 

y=4x+200

if y=324; then
324=4x+200
4x=324-200
4x=124
x=124/4
x=31

There are 31 people at the party 

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