Question

Решите систему уравнений методом подстановки:
{x - 5y = 4
{3x - 8y = -2 

Answer 1

{x - 5y = 4
{3x - 8y = -2

{x = 5y + 4

{ 3(5y + 4) - 8y = - 2

  15 y + 12 - 8y = - 2

   7y = - 2 - 12

   y = -2

Если y = - 2, то x - 5y = 4

                             x - 5*(-2) = 4

                              x + 10 = 4

                              x = -10 + 4

                              x = -6

Ответ: (-6;-2)