SOLUTION: how do i work out this problem? 25x squared +9y squared + 72y -81=0

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Question 307113: how do i work out this problem?
25x squared +9y squared + 72y -81=0
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Work it how?
First, you have to know what you want to do.