Problem preview
A-REI.5 Warmup M1-011-A08-V03

Justify elimination: replacing one equation in a two-variable system with a linear combination preserves solutions.

Find the first invalid step in an elimination solution

Problem

Audit these steps: \(1\)) \(x~+~y~=~6\) and \(x~-~y~=~2\). \(2\)) Add to get \(2x~=~8\). \(3\)) Replace both original equations with \(2x~=~8\). Identify the first invalid step and correct the system.

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Four variants of this problem type
Curriculum context
Course
Math I
Standard
A-REI.5
Category
Algebra
Domain
Reasoning with Equations and Inequalities
Objective
Justify elimination: replacing one equation in a two-variable system with a linear combination preserves solutions.
Problem type
Find the first invalid step in an elimination solution