Without Graphing, Determine Whether the Following Data Set Is Exactly $$\begin{array} { c | c c c c c } \mathrm { x } & 1 & 2 & 3 & 4 & 5 \\\hline \mathrm { y } & 9 & 13 & 17 & 21 & 25\end{array}$$

Multiple Choice

Without graphing, determine whether the following data set is exactly linear, approximately linear or nonlinear.
- $$\begin{array} { c | c c c c c } \mathrm { x } & 1 & 2 & 3 & 4 & 5 \\\hline \mathrm { y } & 9 & 13 & 17 & 21 & 25\end{array}$$

A) nonlinear
B) exactly linear
C) approximately linear