Ответ:

Объяснение:

1. Б

2. В

3. А

4. Б

5. Г

7.

{3x+2y=8

{2x+y=-3;

{y= -3-2x

{3x+2(-3-2x)=8;

{y= -3-2x

{3x - 6 - 4x =8;

{y= -3-2x

{-x=8+6;

{y= -3-2x

{x = -14;

{x = -14;

{y=25.

8.

{3(8x-5)-2(2y-1.5)=24

{5(2x+1)+2(3y-4)=35;

{24x - 15-4y+3=24

{10x+5+6y-8=35;

{24x - 15-4y+3=24

{10x=35-6y+8-5;

{24x - 15-4y+3=24

{10x=38-6y;

{24x - 15-4y+3=24

{x=(38-6y)/10;

{x=(38-6y)/10

24((38-6y)/10) -15-4y+3=24;

{x=(38-6y)/10

{91.2-14.4y - 15 -4y+3=24;

{x=(38-6y)/10

{-18.4y=24+15-3-91.2;

{x=(38-6y)/10

{-18.4y=-55.2;

{x=(38-6y)/10

{y=-55.2/(-18.4);

{x=(38-6y)/10

{y=3;

{y=3

{x=(38-6*3)/10;

{x=2

{y=3.