(a)[2]
$y$ is directly proportional to $x^2$. When $y = 8$ and $x = 4$, determine $y$ for $x = 3$.
(b)[1]
$p$ is inversely proportional to $q$. It is given that $p = 15$ for one particular value of $q$. State the value of $p$ when this value of $q$ is doubled.