Question

решите систему {2,4x-0,9y=-3,6 {1,2y+0,8x=1,8

Answer 1

$\left \{ {{2,4x-0,9y=-3,6} \atop {1,2y+0,8x=1,8}} \right. \\\\\left \{ {{24x-9y=-36} \atop {8x+12y=18}} \right. \\\\\left -\{ {{8x-3y=-12} \atop {8x+12y=18}} \right.$

___________

- 3y - 12y = - 12 - 18

- 15y = - 30

y = 2

8x + 12 * 2 = 18

8x + 24 = 18

8x = - 6

x = - 0,75

Ответ : (- 0,75 , 2)