Question

{2x + y = 5. {3x- y = 5 resolva

Answer 1

 a resposta é: x=2 e y=9

Answer 2

y=5-2x

3x-y=5
3x-(5-2x)=5
3x-5+2x=5
3x+2x= 5+5
5x = 10
x = 10/5
x = 2

y = 5-2x
y = 5-2.2
y= 5-4
y= 1

S = (2,1)