Question

x+2 y=5 / x+y=12 resolva o sistema

Answer 1

x + y = 12..........x = -y + 12
x + 2y = 5

-y +12 + 2y = 5
y = 5 - 12
y = -7

x + y = 12
x + (-7) = 12
x = 12 + 7
x = 19