2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83383A model with flat FRW symmetries and G and Lambda variable,is considered in such a way that the momentum-energy tensor that describes the model is characterized by a bulk viscosity parameter. In this paper it is showed how to apply the dimensional method in order to solve the outlined equations in a trivial way.7 pages. LaTeX2e. Submitted to General Relativity and GravitationGeneral Physicstext