If the pairs of lines x2 2xy ay2 0 and ax2 2xy y2 0have exactly one line in common then the joi...........

If the pairs of lines x²+2xy+ay²=0 and ax²+2xy +y²=0have exactly one line in common then the joint equation of the other two lines is given by

3x²+8xy-3y²=0

3x²+10xy +3y²=0