M(4, 6)
given endpoints (x₁, y₁) and (x₂, y₂) then the coordinates of the midpoint is
M = [[tex]\frac{1}{2}[/tex] (x₁ + x₂ ), [tex]\frac{1}{2}[/tex] (y₁ + y₂ )]
here (x₁, y₁) = (1, 4) and (x₂, y₂) = (7, 8)
M = [[tex]\frac{1}{2}[/tex] (1 + 7 ), [tex]\frac{1}{2}[/tex] (4 + 8)] = (4, 6)
