Question

Resolva os sistemas? {-x+y=3 {x+y=5​

Answer 1

Resposta:

{-x+y=3

{x+y=5

y=3+x

x+1(3+x)= 5

x+3+x= 5

x+x=5-3

2x= 2

x= 2÷2

x= 1

y=3+1

y=4

S={1,4}