[" Which one of the following curves is the orthogonal trajectory of straight lines passing through "],[" a fixed point "(a,b)?]

A straight line passing through a point on a circle is

Find the slopes of the straight lines passing through the following pair is points (-a,b),(b,-a)

Find the equation of the straight lines passing through the following pair of point: (a,b) and (a+b,a-b)

Find the locus of the foot of the perpendicular drawn from the origin to the straight line which passes through the fixed point (a,b).

If a+b+c=0 the straight line 2ax+3by+4c=0 passes through the fixed point

Which of the following straight lines passes through the origin?

Find the locus of the foot of the perpendicular from the orign to a variable straighht line which always passes through the fixed point (a,b) .

(xv) Which one of the following straight line passes through the origin ?

Fill in the Blanks : ____ number of straight lines can be passed through one point.

If the algebraic sum of perpendiculars from n given points on a variable straight line is zero then prove that the variable straight line passes through a fixed point