Answer
$y=-\frac{4}{9}x$ and $y=\frac{4}{9}x$
Work Step by Step
Based on the given hyperbola, the transverse axis is vertical with center $(0,0)$, thus we have asymptotes
$y=\pm \frac{b}{a}x=\pm\frac{\sqrt {16}}{\sqrt {81}}x=\pm\frac{4}{9}x$
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