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1.
If the equations, 
represents two straight lines, then the value of 
is
represents two straight lines, then the value of is
2.
The locus of the mid-point of the portion intercepted between the axes by the line 
where 
is a constant is
where is a constant is
3.
The orthocentre of the triangle formed by 
is
is
4.
The orthocentre of the triangle with vertices 
and 
is
and is
5.
The image of the point 
in the line 
is
in the line is
6.
Family of lines 
for different real 
is
for different real is
7.
The number of the straight lines which are equally inclined to both the exes, is
8.
If one of the lines of 
is a bisector of the angle between the lines 
, then 
is/are
is a bisector of the angle between the lines , then is/are
9.
An equilateral 
in first quadrant is such that 
lies on 
-axis, 
lies on 
-axis and 
is parallel to -axis, then equation of straight line through 
parallel to 
is (‘a’ is length of the side)
in first quadrant is such that lies on -axis, lies on -axis and is parallel to -axis, then equation of straight line through parallel to is (‘a’ is length of the side)
10.
The value for which the equation 
represents a pair of straight lines, is
for which the equation represents a pair of straight lines, is