[" Q52: The locus of the equation "xy=0" is "],[" (a) a straight line "],[" (b) a pair of perpendicular lines "],[" (c) a hyperbola "]

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

If the equation px^(2)-8xy+3y^(2)+14x+2y+q=0 represents a pair of perpendicular lines, then

If the equation px^(2)-8xy+3y^(2)+14x+2y+q=0 represents a pair of perpendicular lines, then

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 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

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

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

If the equation 12x^(2)+7xy-py^(2)-18x+qy+6=0 represents a pair of perpendicular straight lines, then

If the equation 12x^(2)+7xy-py^(2)-18x+qy+6=0 represents a pair of perpendicular straight lines, then

If the equation 12x^(2)+7xy-py^(2)-18x+qy+6=0 represents a pair of perpendicular straight lines, then