1. 2x+2y=-2
x-2y=-4
3x=-6 => x=-2
2.x-2y=6
-2x+2y=-4
-x=2 => x=-2
3.
4.-x+2y=2
3x-2y=-6
2x=-4 =>x=-2
5.x+4y=16
6x-4y=40
7x=36 => x= 36/7 дробь
6.2x+2y=0
2x-y=3
y=3
7.2x-2y=2
x+2y=4
3x=6 =>x=2
8.-x+y=4
4x-y=5
3x=9 =>x=3
9.x+2y=7
-4x-2y=-4
3x=3 =>x=1
10.x-y=1
x+y=3
2x=4 =>x=2
11.2x-2y=8
x+2y=4
3x=12 =>x=4
12.-2x-2y=0
2x+y=2
-y=2 =>y=-2
13.-6x-3y=-3
6x+3y=3
0=0
14.2x-2x=0
x+2y=6
3x=6 =>x=2
15.2x-2y=3
x+2y=6
3x=9 =>x=3