Answer:
the coordinates of point B are : xB = 1 and yB = 3
Explanation:
the coordinates of M are : xM = (xA +xB )/2
yM = (yA +yB )/2
since : xM = -3 and yM = 3
xA = -7 and yA = 3
so : -3 = (-7 +xB )/2
3 = (3 +yB )/2
-6 = -7 +xB
6= 3 +yB
xB = 1 and yB = 3