Решить систему уравнений 6х-9у=-11 9х+3у=11

{3x - 20y = 11

{x + 6y = 10

{3x - 20y = 11

{x = 10 - 6y

{30 - 18y - 20y = 11

{x = 10 - 6y

{y = 0,5

{x = 10 - 6y

{y = 0,5

{x = 7

{9x + 3y = - 6 | : (-3)

{-1,5x + y = - 5

{-3x - y = 2

{-1,5x + y = - 5

{ - 4,5x = - 3

{-3x - y = 2

{x = 2/3

{y = - 8/9