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 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^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 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

The locus of a first degree equation in x,y and z is a (A) straighat line (B) plane (C) sphere (D) none of these

The equation x-2=0 on number line is represented by (a) a line (b) a point (c) infinitely many lines (d) two lines

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 x^2+y^2+2x-4y+5=0 represents a. a point b. a pair of straight lines c. a circle of non zero radius 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 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

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