2x+5y-1=y-x+4
3x-1=2y+2
4x+5=3y-2
6x-3y+4=2y-2
5x+2=3y-1
6x+y-2=2x-3y-1
4x+5y+1=3
3x+4y=5
4x+4y=1
6x-5y=-6
4x+5y=2
3x-2y=3
4x-3y=-7
5x-3y=-3
