Question

{ 3x - y = 3
{ 2x + 5y =19

qual o valor de x - 2y ?​

Answer 1

{3x-y=3 (×5)

{2x+5y=19

15x-5y=15

2x+5y=19

---------------

17x=34

x=34/17

x=2

3x-y=3

3.2-y=3

6-y=3

-y=-3

y=3

Espero ajudar❤