H ( - 7 , 9 )
let the coordinates of H = (x , y )
using the ' midpoint formula '
[tex]\frac{1}{2}[/tex] (x + 5) = -1 → ( multiply through by 2)
x + 5 = - 2 ⇒ x = - 2 - 5 = - 7
[tex]\frac{1}{2}[/tex] (y - 3) = 3 → (multiply through by 2)
y - 3 = 6 ⇒ y = 6 + 3 = 9
H( - 7 , 9 )
