Answer: (31/8, -3)
Explanation:
H(4 1/2,-4 3/4). X(3 1/4, -1 1/4)
H-X=
(4 1/2,-4 3/4)-(3 1/4, -1 1/4)=
(9/2-13/4, -19/4-(-5/4))=
(18/4-13/4, -19/4+5/4)=(5/4, -14/4)
(5/4, -14/4)/2=(5/8, -7/4)
(5/8, -7/4)+(3 1/4, -1 1/4)=
(5/8+13/4, -7/4-5/4)=
(5/8+26/8, -7/4-5/4)=
(31/8, -12/4)=(31/8, -3)