3x+4y−25=03 x+4 y-25=03x+4y−25=0
3x+4y+25=03 x+4 y+25=03x+4y+25=0
4x+3y−25=04 x+3 y-25=04x+3y−25=0
4x+3y+25=04 x+3 y+25=04x+3y+25=0