[tex]\bf ~~~~~~~~~~~~\textit{middle point of 2 points }\\ \quad \\
\begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
% (a,b)
&&(~{{ -4}} &,&{{ -14}}~)
% (c,d)
&&(~{{ -22}} &,&{{ 9}}~)
\end{array}\qquad
% coordinates of midpoint
\left(\cfrac{{{ x_2}} + {{ x_1}}}{2}\quad ,\quad \cfrac{{{ y_2}} + {{ y_1}}}{2} \right)
\\\\\\
\left( \cfrac{-22-4}{2}~~,~~\cfrac{9-14}{2} \right)\implies \left( \cfrac{-26}{2}~~,~~\cfrac{-5}{2} \right)\implies \left(-13~~,~~-2\frac{1}{2} \right)[/tex]
