What is the product of the slopes of the asymptotes of the hyperbola x29−y216=1\frac{x^2}{9} - \frac{y^2}{16} = 19x2−16y2=1?
−16/9-16/9−16/9
16/916/916/9
−9/16-9/16−9/16
9/169/169/16