Decide Which of the Two Given Functions Is Linear and Find

Essay

Decide which of the two given functions is linear and find its equation. $$\begin{array} { | l | l | l | l | l | l | } \hline \boldsymbol { x } & 0 & 1 & 2 & 3 & 4 \\\hline f ( x ) & 5 & 2 & - 1 & - 4 & - 7 \\\hline \boldsymbol { g } ( \boldsymbol { x } ) & 5 & 3.5 & 2 & 0.5 & 0 \\\hline\end{array}$$ ​
Please enter your answer as an equation of a linear function.