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OpenStudy (anonymous):
PLEASE HELP!! In the system shown below, what is the sum of the x-coordinates of all solutions? 7x^(2)+3y^(2)= 18 3y^(2)-7x=47
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OpenStudy (phi):
Are you allowed to use a graphing calculator? Because that looks like the way to do it. See http://www.wolframalpha.com/input/?i=7x%5E%282%29%2B3y%5E%282%29%3D+18%2C+3y%5E%282%29-7x%3D47 the curves never intersect.
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