Question

6y - x = 20
y - x = 20​

Answer 1

Olá!

$\left \{ {{6y-x=20} \atop {y-x=20}} \right.$

y - x = 20

-x = 20 - y

x = -20 + y

6y - x = 20

6y - (-20 + y) = 20

6y + 20 - y = 20

6y - y = 20 - 20

5y = 0

y = 0 ÷ 5

y = 0

y - x = 20

0 - x = 20

-x = 20

x = -20

Resposta: x = -20; y = 0

Abraços!