Question

x+y=-13x-y=3Qual é a resposta dessa conta

Answer 1

{x + y = 13...(2)
{x - y = 3...(2)

2x + 2y = 26
2x - 2y = 6
__________
4x..........= 32

x = 32
......___
.........4

x = 8


x + y = 13

8 + y = 13

y = 13 - 8

y = 5