The answer is -9 do you get it?
Answer:
1) 
2) 
Step-by-step explanation:
Given:

Evaluating
:

Solving for
:

Answer:
3
Step-by-step explanation:
When you go from x=1 to x=3 you go up twice on the x-value. The y value also increases by 6 which means all you have to do is find the average.
6/2= 3
3 is the average increase between x=1 and x=3
Hope this helps!