A
x+y=2
x-y=1
---------------
2x=3/:2
x=3/2
3/2 + y=2
y=2-3/2
y=1/2
Spr.
3/2-1/2=1
B)
2x+y=5
4x-y=10
6x=15/:6
x=15/6
2*15/6+y=5
5+y=5
y=0
4*15/6-y=10
10-y=10
C)
x+y=0/*(-2)
2x+4y=1
-2x-2y=0
2y=1/:2
2x+4*1/2=1
2x+2=1
2x=-1
x=-1/2
D.
3x+2y=2/*(-1)
3x+y=1 1/2
-3x-2y=-2
3x+y=3/2
-----------------
-y=-1/2
3x+1/2=3/2
3x=1/:3
x=1/3
E.
x+2y=-1/2/*(-2)
3x+4y=-1
-2x-4y=1
--------------
x=0
0+4y=-1
4y=-1/:4
y=-1/4
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A
x+y=2
x-y=1
---------------
2x=3/:2
x=3/2
3/2 + y=2
y=2-3/2
y=1/2
Spr.
x-y=1
3/2-1/2=1
B)
2x+y=5
4x-y=10
---------------
6x=15/:6
x=15/6
2*15/6+y=5
5+y=5
y=0
Spr.
4x-y=10
4*15/6-y=10
10-y=10
y=0
C)
x+y=0/*(-2)
2x+4y=1
-2x-2y=0
2x+4y=1
---------------
2y=1/:2
y=1/2
2x+4*1/2=1
2x+2=1
2x=-1
x=-1/2
D.
3x+2y=2/*(-1)
3x+y=1 1/2
-3x-2y=-2
3x+y=3/2
-----------------
-y=-1/2
y=1/2
3x+1/2=3/2
3x=1/:3
x=1/3
E.
x+2y=-1/2/*(-2)
3x+4y=-1
-2x-4y=1
3x+4y=-1
--------------
x=0
0+4y=-1
4y=-1/:4
y=-1/4