Question

encontre os valores no sistema x-y=+1 2x+y=28

Answer 1

x-y=1
x=1+y

2x+y=28
2(1+y)+y=28
2+2y+y=28
3y=28-2
3y=26
y=26/3

x=1+y
x=1+(26/3)
x=(3/3)+(26/3)
x=29/3

Prova:

x-y=1
(29/3)-(26/3)=1
3/3=1
1=1