Answer:
y = -2
Step-by-step explanation:
The midline is the horizontal line that passes exactly in the middle between the graph's maximum and minimum points.
From inspection, curve has a maximum at y = 1 and a minimum at y = -5
The midline between these is [tex]y=\frac{1-5}{2}=-2[/tex]
So the equation for the midline of this graph is y = -2 (shown in red on the attached graph)
