The x and y-coordinates of the midpoint of a segment are given by the following formulas:


Where (xm, ym) is the idpoint, (xA, yA) are point A coordinates and (xB, yB) are point B coordinates.
From the first equation, we can solve for xB:

Similarly for yB:

By replacing -5 for xA and -3 for xm in the first equation, we get:

Replacing -4 for yA and 2 for ym in the second equation, we get:

Then, yB equals 8.
Then, the coordinates of point B are (-1, 8)