SOLUTION: In parallelogram DATE, m∠D = 8x - 20 and m∠A = 2x + 30. Find x.

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Question 257267: In parallelogram DATE, m∠D = 8x - 20 and m∠A = 2x + 30. Find x.
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
In a parallelogram, 2 adjacent angles are supplementary, so, we get
8x-20+%2B+2x+%2B+30+=+180
combining like terms, we get
10x+%2B+10+=+180
10x+=+170
x+=+17