Answer
$$(0, -.5)$$
Work Step by Step
Using the distance formula, we find:
$$\sqrt{\left(1-\left(-1\right)\right)^2+\left(5-\left(-6\right)\right)^2}\\ 5\sqrt{5}$$
Using the midpoint formula, we find:
$$\left(\frac{1-1}{2},\:\frac{5-6}{2}\right) \\ (0, -.5)$$
