1. **State the problem:** Solve the equation $2z = -16$ using the multiplication property. 2. **Recall the multiplication property:** To isolate the variable, divide both sides of the equation by the coefficient of $z$. 3. **Apply the property:** $$2z = -16$$ Divide both sides by 2: $$\frac{\cancel{2}z}{\cancel{2}} = \frac{-16}{2}$$ 4. **Simplify:** $$z = -8$$ 5. **Answer:** The solution is $z = -8$. This means the horizontal line on the graph corresponds to $z = -8$.