_don't understand_

which of the following rules represents the function shown in the table?

a) f( n) = n + 3

b) f(n) = 1/3n

c) f(n) = 3n

F(n) = y and n = x

just a matter of subbing...I will be subbing 6 in for y and 2 in for x
A. f(n) = n + 3
    y = x + 3
    6 = 2 + 3
   6 = 5 (nope...so its not A)

B. f(n) = 1/3n
     y = 1/3x
     6 = 1/3(2)
     6 = 2/3 (nopenot this one either)

C. f(n) = 3n
      y = 3x
      6 = 3(2)
      6 = 6 (got itits this one)