Multiple Choice

A billing analyst is solving the resource system {2x + y = 7, x - 2y = 6} to resolve an invoice discrepancy. After successfully using the elimination method to find that x = 4, the analyst's next step is to substitute this value into the second equation, x - 2y = 6, to solve for y. Which of the following equations correctly represents this substitution step?

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Updated 2026-04-20

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