-4x^2 + y^2 - 2y = 3 re-write as
y^2 - 2y - 4x^2 = 3 complete the square on y
y^2 - 2y + 1 - 4x^2 = 3 + 1
( y - 1)^2 - 4x^2 = 4 divide both sides by 4
(y - 1)^2 x^2
_______ - _____ = 1
4 1
a^2 = 4 b^2 =1
a = 2 b =1
The center is (0, 1) = (h, k)
Equation of asymptote with a positive slope =
y = ( a/b) ( x - h) + k
y= (2/1) ( x - 0) + 1
y = 2x + 1
See the graph here : https://www.desmos.com/calculator/bbtkhsfpum