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OpenStudy (anonymous):
Find two numberss whose sum is 13 and whose squares total 85?
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OpenStudy (lalaly):
x+y=13 x^2 +y^2=85
OpenStudy (lalaly):
x=y-13 substitute it in the second equation to find y
OpenStudy (anonymous):
a+b=13 a^2+b^2=85 2ab=169-85 ab = 84/2=42 a=6 b=7
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