Question

Алгебра помогите пожалуйста​

Answer 1

$1)\left \{ {{5(x+2y)-3=x+5} \atop {y+4(x-3y)=50}} \right.\\\\\left \{ {{5x+10y-3=x+5} \atop {y+4x-12y=50}} \right. \\\\\left \{ {{5x-x+10y=5+3} \atop {4x-11y=50}} \right.\\\\-\left \{ {{4x+10y=8} \atop {4x-11y=50}} \right.\\-------\\21y=-42\\\\y=-2\\\\4x=8-10y=8-10*(-2)=8+20=28\\\\x=28:4=7\\\\Otvet:\boxed{(7 \ ; \ -2)}$

$2)\left \{ {{2,5(x-3y)-3=-3x+0,5} \atop {3(x+6y)+4=9y+19}} \right.\\\\\left \{ {{2,5x-7,5y-3=-3x+0,5} \atop {3x+18y+4=9y+19}} \right.\\\\\left \{ {{2,5x-7,5y+3x=0,5+3} \atop {3x+18y-9y=19-4}} \right. \\\\\left \{ {{5,5x-7,5y=3,5} \atop {3x+9y=15}} \right.\\\\\left \{ {{11x-15y=7} \atop {x+3y=5}|*5} \right. \\\\+\left \{ {{11x-15y=7} \atop {5x+15y=25}} \right. \\-------\\16x=32\\\\x=2\\\\3y=5-x=5-2=3\\\\y=1$

$Otvet:\boxed{(2 \ ; \ 1)}$