Question

решите систему уравнений 4x+3y=-5; 5x+y=-9

Answer 1

$4x + 3y = - 5 \\ 5x + y = - 9 \\ \\ 4x + 3y = - 5 \\ 15x + 3y = - 27 \\ \\ 11x = - 22 \\ y = - 9 - 5x \\ \\ x = - 2 \\ y = - 9 - 5 \times ( - 2) = - 9 + 10 = 1$
Ответ: (-2; 1)

Answer 2

{ 4x + 3y = -5
{ y=-9 -5x

4x+3(-9-5x)=-5

x=-2

y=-9-5*(-2)

y=1

{ 4*(-2)+3*1=-5
{5*(-2)+1=-9

{-5=-5
{-9=-9

otvet (x, y) = ( -2; 1)