Problem 146 of 7
Find and correct the error in this worked system solution: Add 2x + y = 7 and x - y = 2 to get 3x = 5.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
diagnose substitution, elimination, sign, and back-substitution mistakes.
Hidden until you reveal it.
Worked solution must contain one identifiable substitution, elimination, sign, or checking error.
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Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Locate the first algebraic or substitution error.
2. Correct that step.
3. Finish solving and verify in both equations.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Final correction without explaining the source error.