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If x^2 + y^2 = 61 and (x + y)^2 = 121, find x and y.

 Jun 9, 2020
 #1
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Expand R equation

x^2 + 2xy + y^2 = 121     sub in first equation

x^2 + y^2 + 2xy = 121

(61) + 2xy = 121

xy = 30                                          6 and 5 come to mind

 Jun 9, 2020
 #2
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6 et 5 ausi pour moi

 Jun 9, 2020

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