3 Use a graphical approach to solve the following LP.
$$\begin{aligned}
& \text { Maximise } \quad 2 x + 3 y
& \text { subject to } \quad x + 5 y \leqslant 14
& \quad x + 2 y \leqslant 8
& \quad 3 x + y \leqslant 21
& \quad x \geqslant 0
& y \geqslant 0
\end{aligned}$$
Section B (48 marks)