Question

Даю 35 баллов. Решите систему линейных уравнений

Answer 1

$\displaystyle \left \{ {{5x-3y=14} \atop {2x+y=3}} \right. \\\\\left \{ {{5x-3y=13} \atop {y=3-2x}} \right.\\ \\5x-3(3-2x)=13\\x=2\\y=3-2*2\\y=-1\\(x,y)=(2,-1)$

Answer 2

Ответ: x=2 ; y=-1

$\left \{ {{5x - 3y = 13} \atop {2x + y = 3 \: \: \:| \times 3}} \right. \\ \left \{ {{5x - 3y = 13} \atop {6x + 3y = 9}} \right. + \\ 11x = 22 \\ x = 2$

И вместо х поставим 2

$2x + y = 3 \\ 2 \times 2 + y = 3 \\ 4 + y = 3 \\ y = - 1$