3x+2y+1=03 x+2 y+1=03x+2y+1=0
3x+2y−1=03 x+2 y-1=03x+2y−1=0
3x+2y=23 x+2 y=23x+2y=2
3x+2y−2=03 x+2 y-2=03x+2y−2=0