Abstract
In this paper, we consider the solution and periodicity of the following systems of difference equations: x(n + 1) = y(n-2)/1 + y(n-2)x(n-1)y(n), y(n + 1) = x(n-2)/+/- 1 +/- x(n-2)y(n-1)x(n), with initial conditions x(-2), x(-1), x(0), y(-2), y(-1), and y(0) are nonzero real numbers.