Chapter 11 - Systems of Equations and Inequalities - 11.2 Systems of Linear Equations: Matrices - 11.2 Assess Your Understanding - Page 733: 96

$(-\infty , \infty)$ or, $\{x|x \in R\}$

Any value of x in $-e^{x+5}-6$ will return a value of y. Note that the Range of this function is $(-\infty, -6)$, because for any value of x no value of y can be returned such that $y\geq -6$ (See graph for further clarification)