{ 4x -y =9 { 3х -7y =-1

Ответ:

{ 4x -y =9       |*(-7)   {-28x + 7y = -63

{ 3х -7y =-1               {3x - 7y = -1

                                -25x         = -64

                                 x = 2,56

3 * 2,56 - y = 9

-y = 9 - 3 * 2,56

y = 1,32

Ответ: (2,56; 1,32)

Источник: https://znanija.com/task/268583