Answer
-2
Work Step by Step
To find the y value of a point that is equidistant between two points we find the middle. The formula we will use is:
$\frac{x_{1}+x_{2}}{2}, \frac{y_{1}+y_{2}}{2}$
So plugging in our numbers into the formula we have:
$\frac{5+1}{2}, \frac{(-5)+1}{2}$
$\frac{6}{2}, \frac{-4}{2}$
$(3, -2)$
So the y-value of an equidistant point is -2.