Question: Solve the following linear programming model graphically:

\[\begin{aligned} & \max \,\,\,\,Z=1.5{{x}_{1}}+{{x}_{2}} \\ & \text{s}\text{.t}\text{.} \\ & {{x}_{1}}\le 4 \\ & {{x}_{2}}\le 6 \\ & {{x}_{1}}+{{x}_{2}}\le 5 \\ & {{x}_{1}},{{x}_{2}}\ge 0 \\ \end{aligned}\]