Question

Solve this question plz

Answer 1

Let c(x) be cost of x copies.

Linear means c(x) = ax + b

c(5) = 80

c(18) = 116

Find c(10)

a*5 + b = 80

a*18 + b = 116

Subtract 1 from 2:

13*a = 36

a = 36/13 = 2.77

2.77*5 + b = 80

b = 80-13.846 = 66.154

c(10) = 10 * 2.77 + 66.15

c(10) = 93.85

is that correct