Question

Resolva o seguinte sistema:


x + y = 19

x  - y =  3


Resolva o sistema a seguir:



2x - 3y = 550

2x + 2y = 420​

Answer 1

Resposta:

$x+y=19$

$x+0=19$

$x= 19$

$x-y= 3$

$x-0=3$

$x=3$

$2x-3y=550$

$2x-3x0=550$

$2x-0=550$

$2x=550$

$x=275$

$2x+2y=420$

$2x+2x0=420$

$2x+0=420$

$2x=420$

$x=210$