Question

{ x - 3y = 0 { x + 2y = 10 método da adição

Answer 1

Resposta:

x = 6

y = 2

Explicação passo a passo:

$\left \{ {{x-3y=0} \atop {x+2y=10}} \right. \\\\\\\left \{ {{x-3y=0} \atop {-x-2y=-10}} \right. \\\\\\x-3y+(-x)-2y=0+(-10)\\\\x-3y-x-2y=0-10\\\\-3y-2y=-10\\\\-5y=-10\\\\5y=10\\\\y=\frac{10}{5} \\\\y=2\\\\\\x+2y+x-3y=10+0\\\\2x-y=10\\\\2x-2=10\\\\2(x-1)=10\\\\x-1=\frac{10}{2} \\\\x-1=5\\\\x=5+1\\\\x=6$