Question

{x-y=1
-x+3y=3
resposta​

Answer 1

{x - y = 1

{- x + 3y = 3

- y + 3y = 1 + 3

2y = 4

y= 4/2

y= 2

x - y = 1

x - 2 = 1

x= 1 + 2

x= 3

S= ( 3 , 2)