SOLUTION: If angle HDA and angle ADR are supplementary what is the value of x? angle HDA is (7x-3) & angle ADR is (2x-6)

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Question 117867: If angle HDA and angle ADR are supplementary what is the value of x?
angle HDA is (7x-3) & angle ADR is (2x-6)
Answer by jim_thompson5910(21667) About Me  (Show Source):
You can put this solution on YOUR website!
If they are supplementary, then angle HDA +angle ADR =180 degrees. So we have the equation: 7x-3%2B2x-6=180



7x-3%2B2x-6=180 Start with the given equation



9x-9=180 Combine like terms on the left side


9x=180%2B9Add 9 to both sides


9x=189 Combine like terms on the right side


x=%28189%29%2F%289%29 Divide both sides by 9 to isolate x



x=21 Divide

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Answer:
So our answer is x=21