Question

x + y = 1
x - 2y = 1

Answer 1

Resposta:

$\left \{ {{x=1} \atop {y=0} \right.$

Explicação passo a passo:

$\left \{ {{x+y=1} \atop {x-2y=1}} \right.$

$\left \{ {{x=-y+1} \atop {x-2y=1}} \right.$

$\left \{ {{x=-y+1} \atop {(-y+1)-2y=1}} \right.$

$\left \{ {{x=-y+1} \atop {-3y=0} \right.$

$\left \{ {{x=-y+1} \atop {y=0} \right.$

$\left \{ {{x=-(0)+1} \atop {y=0} \right.$

$\left \{ {{x=-0+1} \atop {y=0} \right.$

$\left \{ {{x=1} \atop {y=0} \right.$