Question

$x + 5y = 1 \\ \\ 3x - y = - 13$
​

Answer 1

Resposta:

$(x,y)=(4,1)$

Explicação passo-a-passo:

$\left \{ {{x+5y=1} \atop {3x-y=-13}} \right. \\\left \{ {{x=1-5y} \atop {3x-y=-13}} \right.\\3(1-5y)-y=-13\\y=1\\x=1-5x1\\x=-4\\(x,y)=(4,1)\\\left \{ {{-4+5.1=1} \atop {3.(-4)-1=-13}} \right. \\\left \{ {{1=1} \atop {-13=-13}} \right. \\x,y)=(4,1)$