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HELP! I don’t know what to put down for the formula for question 9a, could someone help?

HELP! I don’t know what to put down for the formula for question 9a, could someone-example-1
User Jamiela
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1 Answer

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those equations add up to the same thing because they are supplementary angles so the equation would be 3x+100=5x+100
User Igor Chubin
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