EQUATION - a statement that the values of two mathematical expressions are equal (indicated by the sign =)., EQUAL - being the same in quantity, size, degree, or value., LINEAR - arranged in or extending along a straight or nearly straight line., SYSTEM - a set of principles or procedures according to which something is done; an organized framework or method., SOLVE - find an answer to, explanation for, or means of effectively dealing with (a problem or mystery).,

SOLVING SYSTEMS OF LINEAR EQUATIONS BY SUBSTITUTION

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