Answer:
Therefore the coordinate of P₂ is (-3,1)
Step-by-step explanation:
Mid point: The mid-point is a point from where the distance of the end points of a line segment is equal.
The co-ordinate of mid point of (x₁,y₁) and (x₂,y₂) is 
Here x₁= -5 and y₁= 9
And the coordinate of the mid point is (-7,1).
Let the coordinate of P₂ be (x,y)
Therefore the coordinate of midpoint of P₁ and P₂ is

According to the problem,



and





Therefore the coordinate of P₂ is (-3,1)