Question

PLEASE HELP!!

Make an equation from these set of numbers.

(X), -1, 0, 1, 2, 3
(Y), 6, 4.5, 3, 1.5, 0

Answer 1

(-1,6), (0,4.5), (1,3), 2, 1.5), (3,0)
is the same as
(-1,6), (0, 9/2), (1,3), 2, 3/2), (3,0).
is the same as

(-1, 12/2), (0, 9/2), (1, 6/2), (2, 3/2), (3,0/2).

Note that as the x-values go up by one, the y-values go down by 3/2.

How can this be written as an equation?