The Purplemath Forums

Is it possible to have a function without a relation? I think the answer is no but I'd like some confirmation or correction! thanks

Here is a word problem I am having difficulty solving: "The director of a summer camp estimates that 100 students will enroll if the tuition is $250. For each $20 increase in tuition, six fewer students will enroll. a. Determine a linear function that will predict the number of students who wil...