Question

{2x - y = 5
{2x + y = 19

Answer 1

Ответ:

{2х-у=5

{2х+у=19

{2х=5

{2х=19

4х=24

х=24÷4

х=6

2×6-у=5

12-у=5

-у=5-12

у=5-12

у=-7

Проверка:

2×6-7=5

12-7=5

5=5

2×6-(-7)=19

12-(-7)=19

19=19