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^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

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

The graph of the equation x^2+y^2=0 in the three dimensional space is (A) x-axis (B) y-axis (C) z-axis (D) xy-plane

In a three dimensional space the equation x^(2)-5x+6=0 represents a.points b. planes c.curves d.pair of straight lines

The equation ax+by+c=0 represents a plane perpendicular to the