dy F. X Assuming 9x - By + xy = 0 defines y as a differentiable function of x, use the theorem dy F. to find dx dx at the point (1, - 1). dy dx ((1, - 1) (Type an integer or a simplified fraction.). Elf 31' Find a and E. xs= 45x2 + #2 = 25ml 5x2 + 3:2 (Type an exact answer, using radicals as needed.) Elf E {if 2 2 . . a = y 1" 5x +3.r2 {Type an exact answer, using radicals as needed}