Question

ayuda por favor doy 5 estrellas​

Answer 1

Respuesta:

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Answer 2

Explicación paso a paso:

$\left \{ {{2X+4Y=18\atop {X-7Y=-27}} \right. \\\\ \left \{ {{2X+4Y=18} \atop {X=-27+7Y}} \right. \\\\ 2(-27+7Y)+4Y=18\\\\ Y=4 \\\\ X=-27+7*4\\\\ X=1\\\\ (X,Y)=(1,4) \\\\ comprobamos :\\ \\ \left \{ {{2*1+4*4=18} \atop {1-7*4=-27}} \right. \\\\ \left \{ {{18=18} \atop {-27=-27}} \right. \\\\resultado: \\ X=1\\\\Y=4$