If the equation `x^(2)+2hxy+2fy+c=0` represents a pair of lines, then

If the equation x^(2)+y^(2)+2gx+2fy+1=0 represents a pair of lines then

If the equation x^(2)+y^(2)+2gx+2fy+1=0 represents a pair of lines then

If the equation ax^(2)+ay^(2)+2gx+2fy+c=0 represents a pair of lines then

Select and write the correct answer from the alternatives in each of the following : If an equation hxy + gx + fy + c = 0 represents a pair of lines, then ……

If the equation ax^(2)+2hxy+by^(2)+25x+2fy+c=0 represents a pair of straight lines,prove that the third pair of straight lines (excluding xy=0) passing through the points where these meet the axes is ax^(2)2hxy+by^(2)+2gx+2fy+c+(4fg)/(c)*xy=0

If the equation ax^(2)+hxy+by^(2)+4gx+6fy+4c=0 represents a pair of lines then

Let the equation ax^(2)+2hxy+2gx+2fy+c=0 represent a pair of parallel lines. Prove that the equation of the line midway between the two parallel lines is hx+by+f=0