Linear
Step-by-step explanation
A linear funciton is a statistical term used to describe a straight-line relationship between two variables,it is defined by

so, if we hve have
EACH INK CARTRIDGE PURCHASED FOR A PRINTER COST $12
it means the total cost depends on the number of printers and the rate,so

let
total cost = y
rate= $12
number of printers = 1, so

therefore,the answer is
Linear
I hope this helps you