Question

5. Resolva o sistema abaixo:
(2x - y=-3
[x+y=3
(A) (0,-3)
(B) (0,3)
(C) (1,3)
(D) (1,-3)​

Answer 1

Resposta:

OPÇÃO (B)

$2x - y = 3 \\ x + y = 3$

$2x - y = 3 \\ y = 3 - x$

$2x - (3 - x) = 3 \\ y = 3 - x$

$2x + x = 3 - 3 \\ y = 3 - x$

$3x = 0 \\ y = 3 - x$

$x = 0 \\ y = 3 - 0$

$x = 0 \\ y = 3$