Question

{y + 2x = -1, {5x-4y,= 10,5.

Answer 1

Ответ:

$\left \{ {{x=0,5} \atop {y=-2}} \right.$

Пошаговое объяснение:

$\left \{ {{y+2x=-1} |4\atop {5x-4y=10,5}|1} \right. \\\\\left \{ {{4y+8x=-4} \atop {5x-4y=10,5}} \right. |+\\\\13x=6,5\\\\x=\frac{6,5}{13} \\\\x=0,5\\\\y+2x=-1\\x=0,5\\y+2*(0,5)=-1\\y+1=-1\\y=-2\\\\\left \{ {{x=0,5} \atop {y=-2}} \right.$