Question

СРОЧНО!!!!даю 20 балов

Answer 1

$\displaystyle\bf\\\left \{ {{3x - 4y = 16 \: \: | \times 3 } \atop {5x + 6y = 14 \: \: | \times 2 }} \right. \\ \displaystyle\bf\\ + \left \{ {{9x - 12y = 48} \atop {10x + 12y = 28 }} \right. \\ \\ 9x + 10x = 28 + 48 \\ 19x = 76 \\ x = 76 \div 19 \\ x = 4 \\ \\ 5 \times 4 + 6y = 14 \\ 20 + 6y = 14 \\ 6y = 14 - 20 \\ 6y = - 6 \\ y = - 6 \div 6 \\ y = - 1$

Ответ: ( 4 ; - 1 )