Question

Даю 35 баллов .Решите методом подстановки.

Answer 1

$1)\; \; \left \{ {{-3x+0,5y=2\; |\cdot 2} \atop {2x-y=0}} \right. \; \left \{ {{-6x+y=4} \atop {2x-y=0}} \right. \; \left \{ {{-6x+2x=4} \atop {y=2x}} \right. \; \left \{ {{-4x=4} \atop {y=2x}} \right. \; \left \{ {{x=-1} \atop {y=-2}} \right.$

$2)\; \; \left \{ {{\frac{1}{6}x-\frac{1}{5}y=1|\cdot 30} \atop {\frac{1}{3}x+\frac{1}{10}y=2|\cdot 30}} \right. \; \left \{ {{5x-6y=30} \atop {10x+3y=60}} \right. \; \left \{ {{5x=30+6y} \atop {2\cdot 5x+3y=60}} \right. \; \left \{ {{5x=30+6y} \atop {2\cdot (30+6y)+3y=60}} \right. \\\\ \left \{ {{5x=30+6y} \atop {60+15y=60}} \right. \; \left \{ {{5x=30+6y} \atop {15y=0}} \right. \; \left \{ {{5x=30} \atop {y=0}} \right. \; \left \{ {{x=6} \atop {y=0}} \right.$