The table shows the outputs y for different inputs x:

input
(x) 2 4 6 8
output
(y) 1 2 3 4

part a: do the data in this table represent a function? justify your answer. (3 points)
part b: compare the data in the table with the relation f(x) = 3x – 10. which relation has a greater value when x = 8? (2 points)
part c: using the relation in part b, what is the value of x if f(x) = 80? (5 points)