Hello Chris,
The asymptotes for a hyperbola should be in the form:
y - k = ± (b/a)* (x-h) where: (h,k) are the coordinates of the center of the hyperbola
For a hyperbola, a is always the square root of the number under the (x-h)^2 parameter
b is always the square root of the number under the (y-k)^2 parameter
That means: a = sqrt(16) = 4; b = sqrt(9) = 3; and the coordinates of the center of the hyperbola whose equation you listed are (5,-2) where h = 5 and k = -2
You can now plug k, b, a and h in the equation I wrote earlier and you will get the right answer.
Cheers.