Question

(1,0) Resolva o sistema de equações

x 2y 4

2x y 3

 + = 

 − =

.​

Answer 1

{x + 2y = 4

{2x - y = 3

2x - y = 3 . 2

4x - 2y = 6

x + 2y = 4

+

4x - 2y = 6

5x + 0 = 10

5x = 10

x = 10/5

x = 2

x + 2y = 4

2 + 2y = 4

2y = 4 - 2

2y = 2

y = 2/2

y = 1

S = {2 , 1}