Решите системы 1)5x-2=2y-1 x-y=7 2)8 (2x-3)-3 (4y-3)=9 0,8x-0,2y=2,2

5x-2y=1
x=7+y;
5(7+y)-2y=1
35+5y-2y=1
3y=-34
y=-34/3
x=7-34/3

16x-24-12y+9=9
16x-12y=24
4x-y=11
-y=11-4x
y=4x-11
4x-3y=6
4x-3(4x-11)=6
4x-12x+33=6
-8x=-27
x=27/8
y=27/2-11