Question

Resolva o sistema pelo método de subtração x-y=3 ,2x+2y=-4​

Answer 1

Resposta:

Explicação passo-a-passo:

$\left \{ {{x - y = 3 .(2)} \atop {2x + 2y =- 4}} \right. \\\\\left \{ {{2x - 2y = 6} \atop {2x + 2y =- 4 +}} \right. \\4x = 2\\x = \frac{2}{4} \\x = \frac{1}{2} \\\\x - y = 3\\\frac{1}{2}- y =3\\-y = 3 - \frac{1}{2}\\- y = \frac{5}{2}\\y = - \frac{5}{2}$