What rule changes the input numbers to output numbers

Destallation they had almost all the rules

Answer is C. 3x - 5

input x = 1, output = 3(1) - 5 = -2
input x = 2, output = 3(2) - 5 = 1
input x = 3, output = 3(3) - 5 = 4
input x = 4, output = 3(4) - 5 = 7

Where are the