Question

resolva os sistemas {X+5y=26}
{2x+y=7}

Answer 1

2x + Y = 7
Y= 7 - 2x
Y= 5x

X + 5y = 26
X= 26 - 5y
X= 21y

Answer 2

x+5y=26
x=26-5y

2x+y=7
2(26-5y)+y=7
52-10y+y=7
-10y+y=7-52
-9y=-45 (-1)
9y=45
y=45/9
y= 5

x+5y=26
x+5(5)=26
x+25=26
x=26-25
x=1

Resp.:{1,5}

Espero ter ajudado:)