Chapter 9 Quadratic Relations and Conic Sections - 9.1 Apply the Distance and Midpoint Formulas - 9.1 Exercises - Skill Practice - Page 617: 10

$$\left(8,\:-6\right)$$

Using the distance formula, we find: $$\sqrt{\left(10-6\right)^2+\left(-9-\left(-3\right)\right)^2}\\ 2\sqrt{13}$$ Using the midpoint formula, we find: $$\left(\frac{10+6}{2},\:\frac{-9-3}{2}\right)\\ \left(8,\:-6\right)$$