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y=2x
2x=y+1
-2x+y=0
2x-y=0
0=0
2.....
y=3x+1
3x+1=4x-2
-3x+y=1
3x-4x=-2-1
-3x+y=1
-x=-3 :(-1)
-3x+y=1
x=3
-3*3+y=1
x=3
-9+y=1
x=3
x=3
y=1+9
x=3
y=10
3....
x+y=1
y= -3 -1
x+y=1
y=-4
x-4=1
y=-4
x=1+4
y=-4
x=5
y=-4