If $y \propto x$ (i.e. $y$ varies directly as $x$), then we have
\begin{equation*}
y=kx,
\end{equation*}
where $k$ is a non-zero constant.
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
If $y \propto x$ (i.e. $y$ varies directly as $x$), then we have
\begin{equation*}
y=kx,
\end{equation*}
where $k$ is a non-zero constant.
