Question

the cost c of going to the movies varies directly with the number of people N attending. A group of four paid $14 to go to the movies on Friday. Write an equation that relates c & n. How much would it cost for seven people to go to the movies.

Answer 1

c = kN
From the data,

14 = 4k
k = 7/2

so,

c = 7/2 N

Now just plug in N=7 to get the cost.

cheap tickets! Must be an old problem, or a discount theater...