Question

2 Розв'яжіть систему рівнянь способом підстановки: 3x+2y=11; x-6y = -3.​

Answer 1

$\displaystyle\bf\\\left \{ {{3x+2y=11} \atop {x-6y=-3}} \right. \\\\\\\left \{ {{x=6y-3} \atop {3\cdot(6y-3)+2y=11}} \right. \\\\\\\left \{ {{x=6y-3} \atop {18y-9+2y=11}} \right. \\\\\\\left \{ {{x=6y-3} \atop {20y=11+9}} \right. \\\\\\\left \{ {{x=6y-3} \atop {20y=20}} \right.\\\\\\\left \{ {{x=6\cdot 1-3} \atop {y=1}} \right. \\\\\\\left \{ {{x=3} \atop {y=1}} \right. \\\\\\Otvet \ : \ (3 \ ; \ 1)$