Determine Whether the Rule Describes a Function with the Given

Short Answer

determine whether the rule describes a function with the given domain and codomain.
- $$G : \mathbf { R } \rightarrow \mathbf { R } \text { where } G ( x ) = \left\{ \begin{array} { l l } x + 2 & \text { if } x \geq 0 \\x - 1 & \text { if } x \leq 4\end{array} \right.$$