Question

зделайте пж срочно ​

Answer 1

Ответ:

$\left \{ {{ \frac{5x - 3y}{4} = \frac{x - 5y}{3} \: \: \: | \times 12 } \atop {7x + y = 12} } \right. \\ \\ \left \{ {{3(5x - 3y) = 4(x - 5y)} \atop {y = 12 - 7x} } \right. \\ \\ \left \{ {{15x - 9y = 4x - 20y} \atop {y = 12 - 7x} } \right. \\ \\ \left \{ {{11x = - 11y} \atop {y = 12 - 7x} } \right. \\ \\ \left \{ {{x = - y} \atop {y = 12 + 7y} } \right. \\ \\ \left \{ {{x = - y} \atop { - 6y = 12} } \right. \\ \\ \left \{ {{x = - y} \atop {y = - 2} } \right. \\ \\ \left \{ {{x = 2} \atop {y = - 2} } \right.$

Ответ: (2; -2)