Question

2x+y=13 e x-y=5 qual o valor de X e Y?

Answer 1

$\left \{ {{2x + y=13} \atop {x- y=5}} \right. \\\\ x = 5 + y\\ 2x + y = 13\\ 2*(5+y) + y = 13 10+2y+y = 13\\ 3y = 13 - 10\\ y = 1\\ x = 5 + y = 5+1 = 6$