Question

Пожалуйста решите алгебру мне завтра нужно ручкой обозначено пожалустаааа

Answer 1

$2)\; \; \left \{ {{ \frac{x+y}{2}+\frac{x-y}{3}=6|\cdot 6 } \atop { \frac{x+y}{4}-\frac{x-y}{3}=6|\cdot 12}} \right. \; \left \{ {{3(x+y)+2(x-y)=36} \atop {3(x+y)-4(x-y)=72}} \right. \; \; \left \{ {{5x+y=36} \atop {-x+7y=72}} \right. \\\\ \left \{ {{5(7y-72)+y=36} \atop {x=7y-72}} \right. \; \; \left \{ {{36y=396} \atop {x=7y-72}} \right. \; \; \left \{ {{y=11} \atop {x=5}} \right.$

$4)\; \; \left \{ {{ \frac{2,5x-2y}{2}-2x=3|\cdot 2} \atop { \frac{3x-2y}{3}+4=3x|\cdot 3 }} \right. \; \; \left \{ {{2,5x-2y-4x=6}\atop {3x-2y+12=9x}} \right. \; \; \left \{ {{-1,5x-2y=6} \atop {-6x-2y=-12}} \right. \; \ominus \\\\ \left \{ {{-1,5x-2y=6} \atop {4,5x=18}} \right. \; \left \{ {{2y=-1,5x-6} \atop {x=4}} \right. \; \; \left \{ {{y=-6} \atop {x=4}} \right.$