Maximize $\backslash ($ z $=3$x$1+4$x$2\backslash )$Subject to:$\backslash (2$x$1+$ x$2\backslash$leq $6\backslash )\backslash (2$x$1+3$x$2\backslash$leq $9\backslash )\backslash ($ x$1,$ x$2\backslash$geq $0,\backslash )$ and both are integers.