Question

responda:sobre metodo da substituicao:
{x-y=5
{x=2y+1

Answer 1

x-y=5
x=2y+1

2y+1-y=5
2y-y=5-1
y=4

x-4=5
x=5+4
x=9

9-4=5

9=2.4+1
9=8+1
9=9

Answer 2

(x-y=5)= (5)!
(x=2y+1)=$- \frac{1}{2}=y$ (x=1)!