The problem appears to be about solving for $y$ in terms of $x$ and constants $a$ and $b$. The given equation is $y = \frac{a}{b}(x-3)^2$.

1. Problem Description

The problem appears to be about solving for $y$ in terms of $x$ and constants $a$ and $b$. The given equation is $y = \frac{a}{b}(x-3)^2$.

2. Solution Steps

The equation is already solved for $y$ in terms of $x$. The equation is $y = \frac{a}{b}(x-3)^2$. There are no further steps to be taken to solve for $y$ in this case, as it is already isolated.

3. Final Answer

$y = \frac{a}{b}(x-3)^2$