5. (a) Given that
$$y = \log _ { 3 } x$$
find expressions in terms of \(y\) for
- \(\log _ { 3 } \left( \frac { x } { 9 } \right)\)
- \(\log _ { 3 } \sqrt { x }\)
Write each answer in its simplest form.
(b) Hence or otherwise solve
$$2 \log _ { 3 } \left( \frac { x } { 9 } \right) - \log _ { 3 } \sqrt { x } = 2$$
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