The following table gives the price per unit for different volume purchases.

# Bought: [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ]

Price Per Unit: [3/5] [5/7] [7/9] [9/11] [11/13]

Write a function statement for the price (P) per unit if x number items are bought.

P(x) = ??

I'm having trouble coming up with an answer. Can anyone quickly find an the answer and provide explanations?