Find a formula for a rational function that has a vertical asymptote at x = 8 and a horizontal asymptote at y = 5. of ( x ) : x - 5 x - 8 Of ( x ) = 5x x - 8 of ( x ) : x - 8 x - 5 Of ( x ) = 8x x - 5 X Of ( x) = (x - 8) (x - 5)