Answer
$s=-6$
Work Step by Step
Use the Division Property of Equality by dividing $9$ to both sides of the equation:
$$\begin{align*}
-54 \div 9&=9s \div 9\\
-6&=s\end{align*}$$
Check the solution by substituting $-6$ to the variable in the given equation:
$$\begin{align*}
-54&=9s\\
-54&\stackrel{?}{=}9(-6)\\
-54&\stackrel{\checkmark}{=}-54\end{align*}$$
Thus, the solution is $s=-6$.
