Question

What are the coordinates of the midpoint of the segment whose endpoints are A(−1, 9) and B(3, 8) ?

Answer 1

$\bf \textit{middle point of 2 points }\\ \quad \\ \begin{array}{lllll} &x_1&y_1&x_2&y_2\\ % (a,b) A&({{ -1}}\quad ,&{{ 9}})\quad % (c,d) B&({{ 3}}\quad ,&{{ 8}}) \end{array}\qquad % coordinates of midpoint \left(\cfrac{{{ x_2}} + {{ x_1}}}{2}\quad ,\quad \cfrac{{{ y_2}} + {{ y_1}}}{2} \right) \\\\\\ \left(\cfrac{{{ 3}} - {{ 1}}}{2}\quad ,\quad \cfrac{{{ 8}} + {{ 9}}}{2} \right)$