2x+2y=10/:2
-x+2y=1
x=2y-1
x+y=5
2y-1+y=5
3y=5+1
3y=6
y=6;3
y=2
...........
x=2×2-1
x=3
2x+2y=10
-x+2y=1|:(-1)
x=-1+2y
2(-1+2y)+2y=10
-2+4y+2y=10
6y=12
x=-1+2*2
x=-1+4
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2x+2y=10/:2
-x+2y=1
x=2y-1
x+y=5
x=2y-1
2y-1+y=5
3y=5+1
3y=6
y=6;3
y=2
...........
x=2×2-1
x=3
x=3
y=2
2x+2y=10
-x+2y=1|:(-1)
x=-1+2y
2(-1+2y)+2y=10
-2+4y+2y=10
6y=12
y=2
x=-1+2*2
x=-1+4
x=3