$$\left. \begin{array} { l } { \quad ( \frac { x - 1 } { 9 } ) ^ { 2 } + ( \frac { y - 3 } { 16 } ) ^ { 2 } = 1 } \\ { \text { O C e r i t r . \right.$$
$x=-\frac{9i\sqrt{y-19}\sqrt{y+13}}{16}+1$
$x=\frac{9i\sqrt{y-19}\sqrt{y+13}}{16}+1$
$x=\frac{-9\sqrt{\left(19-y\right)\left(y+13\right)}+16}{16}$
$x=\frac{9\sqrt{\left(19-y\right)\left(y+13\right)}+16}{16}\text{, }y\geq -13\text{ and }y\leq 19$
