What is the center of the ellipse (x−1)29+(y+4)216=1\frac{(x-1)^2}{9} + \frac{(y+4)^2}{16} = 19(x−1)2+16(y+4)2=1?
(−1,4)(-1, 4)(−1,4)
(1,−4)(1, -4)(1,−4)
(9,16)(9, 16)(9,16)
(−1,−4)(-1, -4)(−1,−4)