Short Answer

Efficiency of Elimination in Sum and Difference Problems

A business analyst is using a system of equations to determine the costs of two different project phases, xx and yy. The system is x+y=800x + y = 800 and xy=200x - y = 200. When solving this system using the elimination method, what specific mathematical characteristic of the coefficients for the variable yy (which are +1+1 and 1-1) allows the variable to be removed immediately by adding the two equations together without any preliminary multiplication?

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Updated 2026-04-16

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