3x+y=5
2x-y=0
y=5-3x
2x-(5-3x)=0
2x-5+3x=0
5x=5|:5
x=1
y=5-3*1
y=5-3
y=2
x+y=1
x=5+y
5+y+y=1
2y=-4|:2
y=-2
x=5-2
x=3
2x-y=0 /+y
y=2x
3x+2x=5
5x=5 /:5
3*1+y=5
5+2y=1
2y=-4 /:2
x=5+(-2)
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3x+y=5
2x-y=0
y=5-3x
2x-(5-3x)=0
2x-5+3x=0
5x=5|:5
x=1
y=5-3x
y=5-3*1
y=5-3
y=2
x+y=1
x=5+y
5+y+y=1
2y=-4|:2
y=-2
x=5+y
x=5-2
x=3
3x+y=5
2x-y=0 /+y
3x+y=5
y=2x
3x+2x=5
5x=5 /:5
3x+y=5
x=1
3*1+y=5
x=1
y=5-3
x=1
y=2
x=1
x+y=1
x=5+y
5+y+y=1
x=5+y
5+2y=1
x=5+y
2y=-4 /:2
x=5+y
y=-2
x=5+y
x=5+(-2)
y=-2
x=3
y=-2