10x−y=2610 x-y=2610x−y=26
5x+3y+9=05 x+3 y+9=05x+3y+9=0
2x+3y+6=02 x+3 y^{}+6=02x+3y+6=0
−10x+2y+39=0-10 x+2 y+39=0−10x+2y+39=0