Question

решите систему уравнений способом сложения

Answer 1

$3x + 9y = - 5 \ x + 5y = 6 : : | times ( - 3) \ \ 3x + 9y = - 5 \ - 3x - 15y = - 18 \ \ - 6y = - 23 \ y = - 23 div ( - 6) \ y = 3 frac{5}{6} \ \ x + 5y = 6 \ x + 5 times 3 frac{5}{6} = 6 \ x = 6 - 5 times frac{23}{6} \ x = 6 - 19 frac{1}{6} \ x = - 13 frac{1}{6} \ \ otvet: : : ( - 13 frac{1}{6} : ; : 3 frac{5}{6} )$