Use the method of second differences to determine whether each of the following tables represent an equation which is linear, quadratic, or neither.

$$\begin{array}{c|c}
x & y \\
\hline
-3 & 6 \\
-2 & 7 \\
-1 & 8 \\
0 & 9 \\
1 & 10
\end{array}$$

$$\begin{array}{c|c}
x & y \\
\hline
-8 & -321 \\
-5 & -141 \\
-2 & -33 \\
1 & 3 \\
4 & -33
\end{array}$$

quadratic

$$\begin{array}{c|c}
x & y \\
\hline
-7 & 6 \\
-2 & 8 \\
3 & 11 \\
8 & 13 \\
13 & 17
\end{array}$$

neither