Решить уравнение: 9y^2-25=0.

\[9y^{2} - 25 = 0\]

\[9y^{2} = 25\]

\[y^{2} = \frac{25}{9}\]

\[y = \pm \frac{5}{3}\]

\[y = \pm 1\frac{2}{3}.\]