Question

{X + 4y = 9
{X + 2y = 7​

Answer 1

Resposta:

S = {(1, 2)}

Explicação passo a passo:

$\left \{ {{x + 4y=9} \atop {x + 2y=7}} \right.\\\\\left \{ {{x + 4y=9} \atop {-x - 2y=-7}} \right.\\\\Somar ~os~dois~membros\\\\2y=2\\\\y=\frac{2}{2=1}\\\\1+4y=9\\\\4y=9-1\\\\4y=8\\\\y=\frac{8}{4}=2$