SOLUTION: Please help me solve this problem: Solve the following proportion. -9/a = 81/-36

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Question 1024449: Please help me solve this problem: Solve the following proportion. -9/a = 81/-36
Answer by FrankM(1040) About Me  (Show Source):
You can put this solution on YOUR website!
-9/a = 81/-36
divide both sides by -9
1/a = 9/36
take reciprocal of both sides
a/1 = 36/9
a = 4