Answer:
Step-by-step explanation:
Since each term is decreased by three 
When the function goes 1 to the right, it goes 2 down. Therefore the direction of the function is

Hence, the function represented is
y = -2x
Given the function f(x);

Evaluating the function f(x+h);

So;

Evaluating the second function;

simplifying further;

Therefore, we have;
the awnser is -6
im very sure let me know if im wrong.