Reformulating the given problem, as shown below, demonstrates that it has only two functional constraints and all variables have non$$negativity constraints. Identify if the given model is true or false.

Maximize Z $=$x$1++$ x$1+4$x$312,$

subject to

$3$x$1++3$x$1+$ x$3<=9$

x$1+$ x$1+2$x$3<=10$

and

x$1+>=0,$ x$1>=0,$ x$3>=0.$