Question 4
In triangle $ABC$, $AB=7$ cm and $AC=9$ cm. $D$ is a point on $AB$ such that $BD=3$ cm. $E$ is a point on $AC$ such that the area of the quadrilateral $BCED$ is $\frac57$ of the area of triangle $ABC$. Find the length, in cm, of $CE$.
Submission guidance: Give a full solution, as required by the examination cover.
Submission guidance: Give a full solution, as required by the examination cover.