The flow graph shown in Figure P6.37 is noncomputable; i.e., it is not possible to compu...

The flow graph shown in Figure P6.37 is noncomputable; i.e., it is not possible to compute the output using the difference equations represented by the flow graph because it contains a closed loop having no delay elements.

(a) Write the difference equations for the system of Figure P6.37, and from them, find the system function of the flow graph.

(b) From the system function, obtain a flow graph that is computable.