study the function table below

Question

vases flowers
4 12
7 21
8 24
11 33
v f

which expression could be used to find the number of flowers (f) in (v) vases?

my answer is a. is that correct

Answer 1

Increase in v: 3 1 3
Increase in f: 9 3 9

Looks like f increases to f+3 3 for every v+1

So, f = 3v+c

Since f is exactly 3*v, c=0, and

f(v) = 3v