Question

помогитее прошу срочноооооооооооо​

Answer 1

1)

$\displaystyle\bf\\\left \{ {{2x + y = - 1 \: \: | \times 3} \atop {5x - 3y = - 19 }} \right. \\ \displaystyle\bf\\ + \left \{ {{6x + 3y = - 3} \atop {5x - 3y = - 19 }} \right. \\ \\ 6x + 5x = - 3 - 19 \\ 11x = - 22 \\ x = - 22 \div 11 \\ x = - 2 \\ \\ 2 \times ( - 2) + y = - 1 \\ - 4 + y = - 1 \\ y = - 1 + 4 \\ y = 3$

2)

$\displaystyle\bf\\\left \{ {{2x + y = - 1 } \atop {5x - 3y = - 19 }} \right. \\ \displaystyle\bf\\\left \{ {{y = - 2x - 1} \atop {5x - 3( - 2x - 1) = - 19 }} \right. \\ \\ 5x + 6x + 3 = - 19 \\ 11x = - 19 - 3 \\ 11x = - 22 \\ x = - 22 \div 11 \\ x = - 2 \\ \\ 2 \times ( - 2) + y = - 1 \\ - 4 + y = - 1 \\ y = - 1 + 4 \\ y = 3$

Ответ: ( - 2 ; 3 )