On aggregating two linear Diophantine equations

The problem of aggregating a general system of two linear Diophantine equations :vith integer coefficients and non-negative integer variables, to form a single linear Diophantine equation with the same solution space, is investigated. New procedures, which generalize and improve upon some results in the literature, are given. Some or all of the variables may be given upper bounds. (C) 1998 Elsevier Science B.V. All rights reserved.