The relationship is $y\propto \frac{1}{\sqrt{x+1}}$. If $x=8$, then $y=3$.
(main)[2]
Express y in terms of x.
Worked solution & mark scheme
This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “\(y=\frac{9}{\sqrt{x+1}}\) or equivalent final answer” …