Question

X+3Y=19 3X+7Y=9
respondam por favor e urgente​

Answer 1

Resposta:

x= 24

y = -53

Explicação passo-a-passo:

$\left \{ {{x+3y=19*(-3)} \atop {3x+7y=9}} \right. \\\\\left \{ {{-3x-9y=-57} \atop {3x+7y=9}}\right. \\(-2y=-48)*(-1)\\2y=48\\y=\frac{48}{2} \\y=24\\\\x+3*24=19\\x+72=19\\x=19-72\\x=-53$