Question

Examine the functions from the table

x f(x)
- 4 - 15
- 3 - 12
-2 - 9
- 1 - 6
0 - 3
1 0
2 3
3 6
4 9

Answer 1

I believe that f(x) = 3(x-1). From the distance between the f(x) values you can infer that the factor in front of x must be 3. Then for x=0  the value is -3. So f(x) = 3x - 3 or 3(x-1).