i believe it is 1/3. but check other sources as well.
For this case we have the following function:

By definition, we have that a linear equation is of the form 
On the other hand, a quadratic equation is of the form
Then, the given equation is not a linear equation, it is not of the form 
Answer:
No, the equation is not linear. It is not of the form 
Answer:
1,000
10,000
100,000
Step-by-step explanation:
The table could include values like this:
x y
-2 -8
-1 -2
0 0
1 -2
2 -8