If the lines represented by the equations kx2+2xy+y2+2x+2y+4=0 are parallel to each other then k=

The condition that the equation ax2+2hxy+by2+2gx+2fy+c=0 represents pair of parallel linesh2=ab,  and af2=bg2 is  For the equation kx2+2xy+y2+2x+2y+4=0, the values are a=k,h=1,b=1Therefore k=1,