układ równań
3x+1y=2
5 2
1(2x-y)=2
2
3x-2- 2x+y=x+1
3 6 6
x+y- -x+y=1-0.8x
5 5
2x-y=2
_________
3x+y+2x-y=2+2
5x=4
x=4/5
x+y-x+y=1-0.8x
3x -2x+y-x=2+1
y=3
3=1-0.8x
0,8x=-2
x=-2.5
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3x+1y=2
1(2x-y)=2
3x+1y=2
2x-y=2
_________
3x+y+2x-y=2+2
5x=4
x=4/5
3x-2- 2x+y=x+1
x+y-x+y=1-0.8x
3x -2x+y-x=2+1
x+y-x+y=1-0.8x
y=3
3=1-0.8x
y=3
0,8x=-2
y=3
x=-2.5