Question

ПОМОГИТЕ СЕГОДНЯ НУЖНО РЕШИТЬ!!!!!!!

Answer 1

$\displaystyle 1)\left \{ {{2x-y=a} \atop {3x+6y=3}} \right.\\ \\\left \{ {{12x-6y=6a} \atop {3x+6y=3}} \right.\\ \\15x=6a+3\\\\x=\frac{2a}{5}+\frac{1}{5}\\ \\x=\frac{2a+1}{5}\\ \\3*\frac{2a+1}{5}+6y=3\\ \\y=\frac{2-a}{5}\\ \\(x,y)=(\frac{2a+1}{5},\frac{2-a}{5})\\ \\2)\left \{ {{4x+y=3} \atop {6x-2y=1}} \right. \\ \\\left \{ {{y=3-4x} \atop {6x-2y=1}} \right.\\ \\6x-2(3-4x)=1\\\\x=\frac{1}{2}\\ \\y=3-4*\frac{1}{2}\\ \\y=1\\\\(x,y)=(\frac{1}{2},1)$