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3x-y=1
2x+y=4
2x-y=4
x+y=5
x+2y=4
3x-3y=-18
3x-2y=6
x+2y=10
0.5x+y=0
2x-y=-5
x-2y-(x+y)=3
x-2y=4
0.5x+0.25y=0.5
x+0.25y=-1
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3x-y=1
2x+y=4
5x=5 |/5
x=1
3*1-y=1
3-y=1 |-3
-y=-2 |*(-1)
y=2
x=1
y=2
-----------------------
2x-y=4
x+y=5
3x=9 |/3
x=3
2*3-y=4
6-y=4 |-6
-y=-2 |*(-1)
y=2
x=3
y=2
------------------
x+2y=4 |*(-3)
3x-3y=-18
-3x-6y=-12
3x-3y=-18
-9y=-30 |/(-9)
y=3,(3)
x+(2*3,3)=4
x+6,6=4
x=4-6,6
x=-2,6
x=-2,(6)
y=3,(3)
-----------------------
3x-2y=6
x+2y=10
4x=16 |/4
x=4
3*4-2y=6
12-2y=6
-2y=6-12
-2y=-6 |/(-2)
y=3
x=4
y=3
--------------------------
0.5x+y=0
2x-y=-5
2,5x=-5 |/2,5
x=-2
0,5*(-2)+y=0
-1+y=0
y=1
x=-2
y=1
----------------------
x-2y-(x+y)=3
x-2y=4
x-2y-x-y=3
x-2y=4
-3y=3 |/(-3)
x-2y=4
y=-1
x-2*(-1)=4
x+2=4
x=2
x=2
y=-1
---------------
0.5x+0.25y=0.5 |*(-2)
x+0.25y=-1
-x-0,5y=-1
x+0,25y=-1
-0,25y=-2 |/(-0,25)
y=8
x+0,25*8=-1
x+2=-1
x=1
x=1
y=8