Problem preview
A-REI.5 Warmup M1-011-A04-V04

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

Decide whether an elimination step is valid

Problem

For \(x~+~y~=~10\) and \(x~-~y~=~2\), a proposed step subtracts the second equation from the first to get \(2y~=~8\). Evaluate the step and state the correct result.

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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
Decide whether an elimination step is valid