Need solution to this difference equation in z-transform

[Pheemmzzyy]

Given the difference equation y + B1y(n-1) + B2y(n-2) = x + Ax(n-1). n>0 where A,B1 and B2 are abitraary constraint. Find an expressions for the Y(Z), the transfer function and draw the flow graph

 

[barry]

Basic transform is: x(n-m)==> z^(-m)X(z)

so what you've got is:

Y(z) + B1*z^(-1)*Y(z) + B2*z^(-2)*Y(z) = X(z) +A*z^(-1)*X(z)

You can figure out the rest...