Problem 96 of 7
Find the first invalid step in this elimination solution: x + 2y = 8 and 2x + 4y = 16, multiply first equation by -2: -2x + 4y = -16, add to second equation.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
audit multipliers, signs, and equation replacement.
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Worked solution must include one first invalid elimination transformation.
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Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Check each multiplier and addition step in order.
2. Verify constants and every variable term.
3. Stop at the first operation that is not equality-preserving.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Later consequence if earlier step was already invalid.