The equation `xy+yz=0` represents (A) a pair of straight lines (B) a pair of parallel lines (C) a pair of parallel planes (D) a pair of perpendicular planes

If the equation ax^2+by^2+cx+cy=0 represents a pair of straight lines , then

The equation x^2-x-2=0 in three dimensional space is represented by (A) a pair of parallel planes (B) as pair of straight lines (C) a pair of perpendicular planes (D) a set containing two distinct points

The equation x^2y^2-9y^2-6x^2y+54 y=0 represents (a) a pair of straight lines and a circle (b) a pair of straight lines and a parabola (c) a set of four straight lines forming a square (d) none of these

The equation xy=0 in three dimensional space is represented by (A) a plane (B) two planes at righat angles (C) a pair of parallel planes (D) a pair of straighat lines

The equation (x-1)(x-2)=0 in thre dimensional space is represented by (A) a pair of straighat lines (B) a pair of parallel planes (C) a sphere (D) none of these

The equation (x-1)(x-2)=0 in thre dimensional space is represented by (A) a pair of straighat lines (B) a pair of parallel planes (C) a sphere (D) none of these

The equation x^2y^2-9y^2-6x^2y+54 y=0 represents (a)a pair of straight lines and a circle (b)a pair of straight lines and a parabola (c)a set of four straight lines forming a square (d)none of these

The equation 3x^2+2hxy+3y^2=0 represents a pair of straight lines passing through the origin . The two lines are

The equation sqrt(x^2 + 4y^2 - 4xy+4) +x-2y=1 represent a (A) straight line (B) circle (C) parabola (D) pair of lines

If the equation 3x^(2)+xy-y^(2)-3x+6y+k=0 represents a pair of straight lines, then the value of k, is