Question

2 x - y = 3 5 x + y = 1 como descobrir o valor d x

Answer 1

$\left \{ {{2x-y=35} \atop {x+y=1}} \right. \\\\ 2x+x-y+y=35+1\\ 3x=36\\\\ x= \frac{36}{3} \\\\ x=12\\\\\\ x+y=1\\ 12+y=1\\ y=1-12\\ y=-11$