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

The locus of xy+yz=0 is (A) a pair of straighat lines (B) a pair of parallel lines (C) a pair of parallel planes (D) none of these

a(x^(2)-y^(2))+xy=0 represents a pair of straight lines for

The equation x^2-x-2=0 in three dimensional space is reresented by (A) a pair of parlle planes (B) as pair of straigh lines (C) a pair of perpendicular planes (D) a set contasining two distinct points

If the equation hxy + gx + fy + c = 0 represents a pair of straight lines, then

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

In the given figure, name: all pairs of parallel lines

If the equation ax^(2)+by^(2)+cx+xy=0 represents a pair of line, then

The equation x^(2)+k_(1)y^(2)+k_(2)xy=0 represents a pair of perpendicular lines if