Question

способом додавання!!! будь ласка дуже срочно!!​

Answer 1

$\displaystyle\bf\\\left \{ {{2x + 3y = 5 \: \: | \times 5 } \atop {5x + 2y = - 4 \: \: | \times( - 2)}} \right. \\\displaystyle\bf\\+\left \{ {{10x + 15y = 25} \atop { - 10x - 4y = 8}} \right. \\ \\ 15y - 4y = 25 +8 \\ 11y = 33 \\ y = 33 \div 11 \\ y = 3 \\ \\ 2x + 3 \times 3 = 5 \\ 2x + 9 = 5 \\ 2x = 5 - 9 \\ 2x = - 4 \\ x = - 4 \div 2 \\ x = - 2$

Ответ: ( - 2 ; 3 )