Question

15 PUNCTE .Rezolavti in multimea numerelor reale sistemul de ecuatii
$\left \{ {{2(3x-y)-5=2x-3y} \atop {5-(x-2y)=4y+16}} \right.$

Answer 1

6x-2y-2x+3y=5; -x+2y-4y=11;;;; 4x+y=5; -x-2y=11;;;amplificam a doua ecuatie cu 4=>4x+y=5; -4x-8y=44, l;; adunam ecuatiile =>-7y=49=>Y=-7=>4x=5+7=> x=3