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SYSTEM OF FIRST-DEGREE EQUATIONS WITH 2 UNKNOWN. A system of first-degree equations with two unknowns is formed by: two first-degree equations with two different unknowns in each equation. This method consists of adding the two equations in such a way that the sum of one of the unknowns is zero. For this to happen, we will need to multiply both equations a few times or just one equation by whole numbers so that the sum of one of the unknowns is zero.