Question

срочно
дам 50 балов
полное решение ​

Answer 1

Ответ:

вот полное решение

чуть не влезло)

Answer 2

$\displaystyle\bf\\\left \{ {{ \frac{x + 2}{6} - \frac{y - 3}{15} = 1 \: \: | \times 30 } \atop { \frac{x + 2.5}{9} - \frac{y + 3}{6} = \frac{1}{3} \: \: | \times 18}} \right. \\ \displaystyle\bf\\\left \{ {{5(x + 2) - 2(y - 3) = 30} \atop {2(x + 2.5) - 3(y + 3) = 6 }} \right. \\ \displaystyle\bf\\\left \{ {{5x + 10 -2 y + 6 = 30} \atop {2x + 5 - 3y - 9 = 6 }} \right. \\ \displaystyle\bf\\\left \{ {{5x - 2y = 14 \: \: | \times 3 } \atop {2x - 3y = 10 \: \: | \times ( - 2) }} \right. \\ \displaystyle\bf\\ + \left \{ {{15 - 6y = 42} \atop { - 4x + 6y = - 20 }} \right. \\ \\ 15x - 4x = 42 - 20 \\ 11x = 22 \\ x = 22 \div 11 \\ x = 2 \\ \\ 5 \times 2 - 2y = 14 \\ 10 - 2y = 14 \\ 2y = 10- 14 \\ 2y = -4 \\ y = - 4 \div 2 \\ y = - 2$

Ответ: ( 2 ; - 2 )