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x+y=3
2x-y=0
2x+2y=10
-2x+y=-1
5x-2y=4
3x+2y=4
7x-3y=11
-7+2y=-12
8x-3y=19
7x+3y=11
-4y-2y=-8
4y+3y=6
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x+y=3
2x-y=0
--------------- +
3x=3/:3
x=1
x+y=2
1+y=2
y=2-1
y=1
x=1
y=1
2x+2y=10
-2x+y=-1
------------ +
3y=9/:3
y=3
2x+2y=10
2x+2*3=10
2x=10-6
2x=4/:2
x=2
x=2
y=3
5x-2y=4
3x+2y=4
------------ +
8x=8/:8
x=1
5x-2y=4
5-2y=4
-2y=4-5
-2y=-1/:(-2)
y=1/2
x=1
y=1/2
7x-3y=11
-7+2y=-12
------------- +
-y=-1/*(-1)
y=1
7x-3y=11
7x-3=11
7x=11+3
7x=14/:7
x=2
x=2
y=1
8x-3y=19
7x+3y=11
------------ +
15x=30/:15
x=2
8x-3y=19
8*2-3y=19
-3y=19-16
-3y=3/:(-3)
y=-1
x=2
y=-1
-4x-2y=-8
4x+3y=6
------------- +
y=-2
4x+3y=6
4x+3*(-2)=6
4x-6=6
4x=12/:4
x=3
x=3
y=-2
1.
x+y= 3
2x-y=0
x+y+2x-y = 3
3x= 3/:3
x=1
2.
2x+2y=10
-2x+y=-1
2x+2y-2x+y=10-1
3y=9/:3
y=3
2x+6=10
y=3
x= 2
y=3
3.
5x-2y=4
3x+2y=4
5x-2y+3x+2y=4+4
8x=8/:8
x=1
x=1
3+2y=4
x=1
y=1/2
4.
7x-3y=11
-7x+2y=-12
7x-3y-7x+2y=11-12
-y=-1
y=1
7x-3=11
y=1
x=2
y=1
5.
8x-3y=19
7x+3y=11
8x-3y+7x+3y= 19+11
15x=30/:15
x= 2
x=2
14+3y=11
x=2
y=-1
6.
-4y-2y=-8
4y+3y=6
-4y-2y+4y+3y=-8+6
y= -2