Hi Nav L.
(-3, 4)
With the information given, you can use the Midpoint Formula, which gives the coordinates of the Midpoint,(x, y) to solve for the coordinates of the endpoint.
Midpoint Formula
(x1 + x2/2, y1 + y2/2)
Let (x1, y1) = (11, -2) the Endpoint given
Let (x2, y2) = the coordinates we need to find
Let (x, y) = (4, 3) the Midpoint given
x1 + x2/2 = x
(11 + x2)/2 = 4
Multiply both sides of the Equation by 2
11 + x2 = 8
Subtract 11 from both sides of the equation
x2 = 8 - 11
x2 = -3
Repeat the process for the missing y2 coordinate of the other endpoint
y1 + y2/2 = 3
(2 + y2)/2 = 3
2 + y2 = 6
y2 = 4
I hope you find this useful if you have any questions please send me a message.