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 x−y=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?

0

1

Updated 2026-09-17

Contributors are:

Who are from:

Tags

OpenStax

Elementary Algebra @ OpenStax

Ch.5 Systems of Linear Equations - Elementary Algebra @ OpenStax

Algebra

Math

Prealgebra

Recall in Bloom's Taxonomy

Related