Abstract
In this paper we study the periodicity and the form of the solutions of the following systems of difference equations of order two
x(n+1) = y(n)x(n-1)/+/- x(n-1) +/- y(n), y(n+1) = x(n)y(n-1)/+/- x(n) +/- y(n-1), n is an element of N-0,
with nonzero real numbers initial conditions.