Respuesta :

mourfious

answer;

B) 12

_________

explanation:::

after adding both equation

we \: get..

{x}^{2} + xy + {y}^{2} + xy = 62 + 82

x^2 + y^2 + 2xy = 144

(x + y)^2 = 144

(x + y) = sqrt{144}

x + y = 12

it may be helpful for u

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