Question

решите систему линейных уравнений

Answer 1

$\left \{ {{y-3x-5=-6} \atop {2x+y=9}} \right.\\\\ -\left \{ {{-3x+y=-1} \atop {2x+y=9}} \right.$
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- 3x - 2x = - 1 - 9
-5x = - 10
x = 2
y = 9 - 2x = 9 - 2 * 2 = 9 - 4 = 5
Ответ : (2 ; 5)

Answer 2

Ответ:.......................