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If you wanted an output of 7 for the rule y = -x + 4, what would you need as an input?
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If you wanted an output of 7 for the rule y = -x + 4, what would you need as an input?

User Chris Barlow
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Y is your output, so y=7. Now you have 7=-x+4. You then would subtract 4 from both sides, leaving you with 3=-x. Then divide -1 from both sides so you have x=-3. Your answer is -3.
User Xbrady
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