If the image of function y = A-X / x-a-1 is symmetric with respect to point (4, - 1), what is the value of real number a?

If the image of function y = A-X / x-a-1 is symmetric with respect to point (4, - 1), what is the value of real number a?

Y = A-X / x-a-1 = - (x-a-1) - 1 / x-a-1 = - 1-1 / x-a-1 this function is an inverse function, which is symmetric about (a + 1, - 1). That is: a + 1 = 4, a = 3. This function model is: y = a + B / X + C. It is symmetric about (- C, a). OK, my answer is over,