Question

What is the formula of the coordinate of the point dividing the join of (x1y1) and (x2y2) in 2 equal parts

Answer 1

it's nothing but coordinate of mid point. i.e. ((x1+x2)/2, (y1+y2)/2)

Answer 2

m¹x²+m²x²/m¹+m² ; m¹y²+m²y¹/m¹+m²