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OpenStudy (anonymous):
x^2+y^2=25 36x^2-4y^2=144
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OpenStudy (lalaly):
multiply the first equation by 4 4x^2+4y^2=100 36x^2-4y^2=144 subtract both equations -32x^2=-44 x^2=8/11 substitute in first equation 8/11 +y^2=25 y^2= 25-8/11 y^2=267/11
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